Vitamins & Supplements · Supplement formula
Sleep Blends (Melatonin, Magnesium, L-Theanine, Herbs)
Multi-ingredient sleep formulas · also called Sleep blends, sleep aid supplements, sleep gummies, suplementos para dormir
Sleep blends are products that combine ingredients such as melatonin, magnesium, L-theanine and herbs like valerian in one capsule, gummy or drink. Only a few finished blends have been tested, and each mix was different. Most research is on single ingredients, with small or mixed results for sleep. Label amounts can be wrong, and kava, valerian and children's gummies carry specific cautions.
General information, not medical advice. Last substantive update · Not medically reviewed. A named clinician has not signed off on this page. How this page is made
About Sleep Blends (Melatonin, Magnesium, L-Theanine, Herbs)
Sleep blends mix several sleep ingredients in one product. Research on finished blends is thin; most evidence is for single ingredients and is low or mixed. Main cautions are wrong label amounts, children, and kava or valerian.
What sleep blends are
A sleep blend puts several ingredients into one capsule, gummy, powder or drink. They are sold to people who have trouble falling asleep or want better sleep.
A blend is not the same as a single ingredient. Trials test one exact mix, so what is found for one mix cannot be assumed for another.
What is usually inside
Common ingredients are melatonin, magnesium, L-theanine, valerian, passionflower, chamomile, GABA, tryptophan or 5-HTP, kava and lemon balm. Hops, ashwagandha and zinc also appear in trials.
Magnesium, L-theanine, glycine, tryptophan, GABA, valerian, hops, lemon balm and passionflower have their own pages on this site, linked below. Amounts of these in foods were not read from USDA or NIH sources, so none are stated here.
Reading the label
A proprietary blend lists one total weight for several ingredients, so the amount of each is hidden. % Daily Value compares a nutrient in a serving with a reference amount. Gummies and capsules can differ in the extras they add.
Tests of melatonin products found label amounts that were far off. A label cannot be assumed to match the bottle.
What the research shows
Finished blends: a few small or short trials, with different mixes and mixed results. One melatonin, magnesium and zinc trial had 43 people.
Single ingredients: melatonin gives a few minutes faster sleep onset in some pooled trials but not in all; magnesium, L-theanine and ashwagandha have small, low-certainty results; valerian is inconsistent. Guidelines recommended against melatonin and valerian for chronic insomnia.
At a glance
Traditional uses history, not proof
- Valerian, chamomile and hops are old herbal sleep remedies
- Sold as night-time sleep aids
Studied for research
- Finished blends and sleep quality, low certainty
- Melatonin and falling asleep, low certainty
- Magnesium, very low certainty
- L-theanine, low certainty
- Valerian, mixed evidence
- Ashwagandha, low certainty
- Kava, chamomile, tryptophan and 5-HTP, insufficient evidence
Main compounds
- Melatonin
- Magnesium
- L-theanine
- Valerian and hops extracts
- Ashwagandha
Common forms
- Capsules and tablets
- Gummies
- Powders and drinks
- Single-ingredient and multi-ingredient products
Research links: 2011 trial: melatonin, magnesium and zinc in older care-home residents · 2023 trial: hops, valerian and low-dose THC mixes (620 adults) · 2023 review: melatonin and ramelteon for insomnia (22 studies) · 2025 review: L-theanine and sleep (19 trials) · 2022 report: pediatric melatonin ingestions · Research Library · Genes & Biomarkers Library
What it is and its history
- Accepted scientific name
- Sleep supplement blends (multi-ingredient sleep formulas)
- Common names
- Sleep blend (English); Sleep aid supplement (English); Sleep gummies (English); Suplemento para dormir (Spanish); Fórmula para el sueño (Spanish)
- Family or group
- Formula product. A sleep blend combines several ingredients in one capsule, tablet, gummy, powder or drink. Typical ingredients named in the existing summary: melatonin, magnesium, L-theanine, valerian, passionflower, chamomile, GABA, tryptophan or 5-HTP, kava and lemon balm.
- Harvest and processing
- Herbal ingredients are usually concentrated into extracts, and melatonin is mostly made synthetically (NCCIH). Product-making details beyond that were not read.
- Look-alikes and adulterants
- Name: Melatonin alone; Note: A single-ingredient product; most research is on this.; Name: Magnesium products; Note: Single-ingredient or multi-mineral products; has its own page.; Name: Sleep teas; Note: Herbal teas such as chamomile or valerian; have their own pages.; Name: Prescription sleep medicines; Note: Regulated drugs, not supplements.
- Sustainability and conservation
- Not assessed.
What is inside, and how it may work
What it contains and how those compounds act in cells and animals. Laboratory and animal mechanisms are not proven effects in people.
Main compounds
| Compound | Family | Where it is concentrated | Activity studied | Level of evidence |
|---|---|---|---|---|
| Melatonin | hormone | Not read from a source. | The usual lead ingredient. A hormone that helps time the body clock; made synthetically in most supplements (NCCIH). 26 15 | Human data |
| Magnesium (citrate, glycinate, oxide and other salts) | mineral | Not read from a source. | Added for relaxation. Tested alone for sleep in older adults with low-quality results. 14 1 | Human data |
| L-theanine | amino acid found in tea | Not read from a source. | Added for calm. Small self-rated sleep gains in pooled trials, many with mixed products. 4 | Human data |
| Valerian root extract | herbal extract | Root or flowering parts (extract); not read in detail Not read from a source. | A traditional sleep herb. Trial results inconsistent; extract quality varies. 2 22 28 | Human data |
| Hops extract or oil | herbal extract | Root or flowering parts (extract); not read in detail Not read from a source. | Tested together with valerian in blend trials; not tested alone in the sources read. 17 11 21 | Human data |
| Ashwagandha extract | herbal extract | Root or flowering parts (extract); not read in detail Not read from a source. | A root used in Ayurveda; small pooled benefit for sleep in 5 trials. 5 | Human data |
| Kava | herbal extract | Root or flowering parts (extract); not read in detail Not read from a source. | Said to be sedating. Linked to rare serious liver injury. 25 23 | Human data |
| Chamomile | herbal extract | Root or flowering parts (extract); not read in detail Not read from a source. | Traditional sleep tea; no conclusive trial evidence (NCCIH). 27 | Human data |
| L-tryptophan and 5-HTP | amino acid and its by-product | Not read from a source. | Can be changed into melatonin in the body. A guideline recommended against tryptophan for chronic insomnia. 27 | Human data |
| Zinc | mineral | Not read from a source. | Appeared together with melatonin and magnesium in one blend trial (43 people). 20 | Human data |
| Passionflower, lemon balm and oral GABA | herbal extracts and amino acid | Not read from a source. | Commonly listed on blend labels. No review was read for this page. 30 | Listed only |
Mechanisms, receptors and pathways
| Target or pathway | Gene or receptor | What was found | Level |
|---|---|---|---|
| Body clock timing | Not specified in the sources read | Melatonin helps time circadian rhythms and sleep; light at night can block its production (NCCIH). This describes the natural hormone; it does not show a blend works. 26 | Agency statement |
| Conversion in the body | Not specified | L-tryptophan and 5-HTP can be changed into melatonin in the body and have sedative effects, but it is unclear how they work and data on insomnia are very limited (NCCIH). 27 | Agency statement |
| Stress hormone pathway (animal data) | Not specified | In a mouse model a walnut peptide and theanine combination lowered the stress hormone corticosterone and restored slow-wave sleep. This is animal work, and the abstract gives no human numbers. 9 | Animal research |
| Combined action of several ingredients | Not applicable | No study read tested whether ingredients in a sleep blend add to, cancel or change each other's effects. How blends work is unknown. | Not established |
Absorption, metabolism and elimination
- Absorption
- Not found for blends. Ingredients are absorbed in different ways, and none of the sources read compared absorption inside a blend with absorption alone.
- Distribution
- Not found.
- Metabolism
- Not found.
- Elimination
- Not found.
- Bioavailability
- Not compared across products in the sources read.
Isolated compounds versus whole extracts
A sleep blend is a mix of isolated ingredients and concentrated extracts. Foods and teas that contain some of these ingredients, such as tea with L-theanine or magnesium-rich foods, bring other nutrients in different amounts. No trial compared blends with food sources.
Nutritional composition
Amounts of magnesium, L-theanine or melatonin in common foods were not read from USDA or NIH sources, so none are stated here. Blend labels may list amounts as milligrams per serving, as a percentage of Daily Value for minerals, or as one combined weight for a proprietary blend.
1 mixed findings6 low certainty1 very low certainty1 not enough evidence
What was looked at
The 9 benefits and uses checked for Sleep Blends (Melatonin, Magnesium, L-Theanine, Herbs), each with how strong the evidence is. Tap one to open it.
- Finished sleep blends: sleep quality and sleep disturbanceLow certainty
- Melatonin (the most common blend ingredient): falling asleep in adults with insomniaLow certainty
- Magnesium: falling asleep and sleep qualityVery low certainty
- L-theanine: sleep qualityLow certainty
- Valerian: sleep qualityMixed findings
- Ashwagandha: sleepLow certainty
- Melatonin for jet lag, delayed sleep timing and shift workLow certainty
- Melatonin and sleep in childrenLow certainty
- Kava, chamomile, tryptophan, 5-HTP and other add-insNot enough evidence
Lab markers tracked in the studies
Time to fall asleepSleep quality and sleep disturbance scoresTime to fall asleep (magnesium trials)Self-rated sleep quality (L-theanine trials)
What is Sleep Blends (Melatonin, Magnesium, L-Theanine, Herbs) good for?
The main studied uses and how strong the human evidence is for each. Few finished blends were tested, so most rows describe single ingredients, which are labelled as such. Results for one ingredient are not added up for a mix.
Benefits, one by one
Each card is a research question, not a promise. Tap a goal to filter. Open a card to see the studies, doses and limits.
Finished sleep blends: sleep quality and sleep disturbance
Low certaintyA few trials tested finished blends, and each tested a different mix. An 8-week trial in 43 older care-home residents found better sleep scores with a melatonin, magnesium and zinc mix than with placebo. A 4-week trial in 620 adults found one hops, valerian and low-THC mix beat placebo on self-rated sleep disturbance, while a second mix did not. A valerian and hops tablet gave only modest gains in 184 adults. Results from one mix cannot be carried over to another product.
5 studiesMixes and ingredient amounts differ in every trial. Amounts studied a…
Studies, doses and limits
What the trials found
Rondanelli 2011: 43 people with primary insomnia, average age about 78, in one Italian care home, took a melatonin, magnesium and zinc food supplement mixed in pear pulp or plain pear pulp for 8 weeks. Sleep quality scores were better with the supplement (difference between groups 6.8 points, 95% CI 5.4 to 8.3). Kolobaric 2023: 620 adults wanting better sleep took one of two melatonin-free mixes of hops oil, valerian oil and a small amount of THC, or placebo, for 4 weeks. The mix with more botanicals and less THC beat placebo on self-rated sleep disturbance, anxiety, stress and well-being. The other mix did not differ from placebo. Morin 2005: 184 adults with mild insomnia took a valerian and hops combination, diphenhydramine or placebo. Improvements were modest and few comparisons with placebo were significant. Schicktanz 2025: a 40-person feasibility trial of one valerian and hops extract found about 22 minutes more sleep a night on a fitness tracker (exploratory result). A 2026 report on a walnut peptide and theanine mix included a human trial, but its abstract gives no numbers for that trial.
Results
Mixed and product-specific. Two small-to-medium trials were positive on sleep scores. The two larger or better-controlled herbal trials gave modest or split results.
Effect sizes as reported
Rondanelli: sleep quality score difference 6.8 points (95% CI 5.4 to 8.3). Others: significance reported without plain-unit sizes in the abstracts, except about 21.7 minutes more sleep in the 40-person trial.
Why this rating
Low because each trial tested a different mix, most were small or short, self-rated scores dominate, and the one trial of the melatonin, magnesium and zinc mix was in 43 older people in one care home. Not rated lower because several controlled trials exist.
Form and dose studied
Mixes and ingredient amounts differ in every trial. Amounts studied are in the studies table only.
Who was studied
Older care-home residents with insomnia; healthy adults wanting better sleep; adults with mild insomnia.
Limits
Different mixes, short trials, mostly self-rated outcomes. Funding is not stated in several abstracts. One mix included THC. Results cannot be split between ingredients.
Why researchers looked
Many sleep products combine ingredients on the idea that they work better together, so researchers tested a few such mixes.
Traditional use
Valerian and hops have been used as herbal sleep aids for a long time. Melatonin, magnesium, zinc and L-theanine are modern supplement ingredients.
Proposed mechanism Not established
Not established for any finished blend. The trials did not test how the ingredients work together.
A proposed mechanism does not show that the effect happens in people.
Side effects were mild or moderate and not more frequent than placebo in the 620-person trial. See the Safety tab.
Melatonin (the most common blend ingredient): falling asleep in adults with insomnia
Low certaintyThis result is for melatonin on its own, not for blends. A 2023 pooled review of 22 studies found prolonged-release melatonin shortened time to fall asleep by about 5 to 6 minutes in adults with insomnia. A 2022 review of 24 trials found melatonin did not clearly help adults with long-term insomnia, but might help children and teenagers. US and VA/DoD sleep guidelines recommended against it for chronic insomnia.
2 studiesMost studies in the 2023 review used prolonged-release melatonin. Amo…
Studies, doses and limits
What the trials found
Maruani 2023 pooled 22 studies (4,875 people, melatonin and ramelteon): compared with placebo, prolonged-release melatonin shortened self-rated time to fall asleep by 6.30 minutes and measured time to fall asleep by 5.05 minutes, and raised measured sleep efficiency by 1.91 percentage points. Choi 2022 pooled 24 placebo-controlled trials in chronic insomnia: in adults without other illness, melatonin did not significantly improve time to fall asleep, total sleep time or sleep efficiency; in children and teenagers it did. NCCIH adds that a 2022 review of 12 studies (2,666 people) found shorter time to fall asleep but no better sleep quality or time awake at night, and that the 2017 American Academy of Sleep Medicine and 2019 VA/DoD guidelines recommended against melatonin for chronic insomnia.
Results
Small gain in time to fall asleep in some pooled analyses; not shown to help adults with long-term insomnia in another; guidelines advise against it for chronic insomnia.
Effect sizes as reported
Self-rated time to fall asleep -6.30 minutes; measured -5.05 minutes; sleep efficiency +1.91 points (prolonged-release melatonin, 2023 review).
Why this rating
Low because two pooled reviews disagree for adults, gains are a few minutes, and the studies used prolonged-release melatonin, which may not be the form in a given blend. This is evidence for one ingredient, not for blends.
Form and dose studied
Most studies in the 2023 review used prolonged-release melatonin. Amounts are in the studies table only.
Who was studied
Adults with insomnia disorder; children and teenagers with chronic insomnia (2022 review).
Limits
Evidence for blends containing melatonin was not found. Melatonin amounts on labels can differ from the bottle (see Safety).
Why researchers looked
Melatonin is the body's own night-time timing hormone, so it is the best-known sleep supplement and sits in many blends.
Traditional use
Melatonin is a hormone made by the brain in response to darkness. Supplements are mostly made synthetically (NCCIH).
Proposed mechanism Agency statement
Melatonin helps time the body clock (NCCIH). How it would act inside a blend was not studied.
A proposed mechanism does not show that the effect happens in people.
See the Safety tab for label accuracy, drowsiness and children.
Magnesium: falling asleep and sleep quality
Very low certaintyThese results are for magnesium on its own. A 2021 pooled review of three small trials in 151 older adults found about 17 minutes less time to fall asleep with magnesium than placebo, but the trials were at moderate-to-high risk of bias and the evidence was low to very low quality. A 2022 review of 9 studies (7,582 people) found a link between magnesium status and sleep in observational studies but contradictory trial results.
3 studiesAmounts studied are in the studies table only. Forms of magnesium dif…
Studies, doses and limits
What the trials found
Mah 2021: three randomised trials of oral magnesium versus placebo in 151 older adults with insomnia in three countries. Time to fall asleep after treatment was 17.36 minutes shorter (95% CI -27.27 to -7.44). Total sleep time was 16.06 minutes longer, which was not statistically significant. All trials had moderate-to-high risk of bias. Arab 2023: 9 observational and randomised studies (7,582 people): observational studies linked magnesium status with sleep quality, while randomised trials gave contradictory results and an uncertain link. Rawji 2024: 15 trials of magnesium for anxiety or sleep (8 on sleep); 5 of 8 sleep studies reported improvements, 2 reported none and 1 mixed; the authors say firm conclusions are limited.
Results
Possible small gain in time to fall asleep in older adults in low-quality trials; trial results overall are mixed.
Effect sizes as reported
Time to fall asleep 17.36 minutes shorter (95% CI -27.27 to -7.44); total sleep time +16.06 minutes, not significant.
Why this rating
Very low because the pooled trials were few (three, 151 people), at moderate-to-high risk of bias and rated low to very low quality, and later reviews found conflicting results.
Form and dose studied
Amounts studied are in the studies table only. Forms of magnesium differ between trials.
Who was studied
Older adults with insomnia (pooled trials); mixed adult groups in other reviews.
Limits
The evidence is for magnesium alone, not for blends. Magnesium in blends comes in many salts and amounts.
Why researchers looked
Magnesium is a mineral involved in nerve and muscle function, and low intake has been linked with poorer sleep in surveys, so trials tested supplements.
Traditional use
Magnesium is an essential mineral found in foods. Amounts in foods were not read from USDA or NIH sources, so none are stated here.
Proposed mechanism Not established
Not established in these reviews.
A proposed mechanism does not show that the effect happens in people.
Too much magnesium from supplements can cause diarrhea and cramps. See the Safety tab.
L-theanine: sleep quality
Low certaintyA 2025 pooled review of 19 randomised articles (897 people) found small improvements in self-rated time to fall asleep, daytime function and overall sleep quality with L-theanine. The authors point out that there were few trials of pure L-theanine; many tested mixes.
1 studiesAmounts studied are in the studies table only.
Studies, doses and limits
What the trials found
Bulman 2025 searched six databases to September 2024 and included 19 randomised trials (897 people); 18 were pooled. L-theanine improved self-rated time to fall asleep (SMD 0.15, 95% CI 0.01 to 0.29, 10 studies), self-rated daytime dysfunction (SMD 0.33, 95% CI 0.16 to 0.49, 9 studies) and overall self-rated sleep quality (SMD 0.43, 95% CI 0.04 to 0.83, 12 studies). The authors say studies of pure L-theanine are lacking and the right amount and length of use are not known.
Results
Small self-rated gains, some from products that combined L-theanine with other ingredients.
Effect sizes as reported
Standardised mean differences 0.15 (time to fall asleep), 0.33 (daytime dysfunction), 0.43 (sleep quality).
Why this rating
Low because effects are small, based on self-rated scores, and many trials used L-theanine together with other ingredients, so the gain cannot be credited to L-theanine alone.
Form and dose studied
Amounts studied are in the studies table only.
Who was studied
Healthy people and people with health conditions, all ages (pooled trials).
Limits
Many included trials were not of pure L-theanine; results are self-rated.
Why researchers looked
L-theanine is an amino acid found in tea, studied for calm and relaxation, so trials tested whether it helps sleep.
Traditional use
L-theanine is found in tea (Camellia sinensis). Amounts in tea were not read from USDA or NIH sources, so none are stated here.
Proposed mechanism Not established
Not established in the review.
A proposed mechanism does not show that the effect happens in people.
No safety signal was described in the abstract. See the Safety tab.
Valerian: sleep quality
Mixed findingsPooled reviews of valerian root disagree and are limited by weak trials. A 2006 review of 16 trials (1,093 people) found more people reporting better sleep, with signs of publication bias. A 2020 review of 60 studies said outcomes were inconsistent, possibly because extract quality varies. NCCIH says the evidence is inconsistent, and the 2017 American Academy of Sleep Medicine guideline recommended against valerian for chronic insomnia in adults.
3 studiesExtract type varies a lot between trials; amounts studied are in the …
Studies, doses and limits
What the trials found
Bent 2006: 16 placebo-controlled trials, 1,093 people. Six studies reported a yes/no sleep-improved outcome with relative risk 1.8 (95% CI 1.2 to 2.9), but there was publication bias, and most studies had significant methodological problems. Shinjyo 2020: 60 studies (6,894 people); a pooled analysis of subjective sleep quality used 10 studies (1,065 people). The authors say inconsistent outcomes were possibly due to variable extract quality and that more reliable effects could be expected from whole root; they found no severe adverse events in people aged 7 to 80. NCCIH (valerian page): evidence for sleep problems is inconsistent; not enough evidence for any health condition.
Results
Mixed and inconsistent; not shown to work for chronic insomnia.
Effect sizes as reported
Relative risk of improved sleep 1.8 (95% CI 1.2 to 2.9; 2006 review, publication bias).
Why this rating
Mixed because pooled analyses lean positive but are weakened by poor trial quality, publication bias and variable extracts, and a guideline recommended against use for chronic insomnia.
Form and dose studied
Extract type varies a lot between trials; amounts studied are in the studies table only.
Who was studied
Adults, and people aged 7 to 80 in the safety review.
Limits
Different extracts, doses and durations. The 2020 review is by authors who suggest herbal partners may help, which is a claim the review did not test directly.
Why researchers looked
Valerian root has a long history as a calming herb, so it appears in many sleep blends and has been tested often.
Traditional use
Valerian (Valeriana officinalis) is native to Europe and Asia and has been used medicinally since early Greece and Rome (NCCIH).
Proposed mechanism Not established
Not established.
A proposed mechanism does not show that the effect happens in people.
Rare liver injury has been reported; do not combine with alcohol or sedatives (NCCIH). See the Safety tab.
Ashwagandha: sleep
Low certaintyAshwagandha is added to some sleep blends. A 2021 pooled review of 5 randomised trials (400 people) found a small-to-moderate improvement in overall sleep with ashwagandha extract, larger in adults with insomnia and in trials of 8 weeks or more. The authors say safety data are limited.
1 studiesAmounts studied are in the studies table only.
Studies, doses and limits
What the trials found
Cheah 2021 pooled 5 randomised trials of ashwagandha extract versus placebo in 400 adults. The standardised mean difference for overall sleep was -0.59 (95% CI -0.75 to -0.42; I2 = 62%). The effect was larger in adults with insomnia and in treatments of 8 weeks or more. Mental alertness on rising and anxiety also improved; quality of life did not. No serious side effects were reported.
Results
Small pooled benefit for sleep in few trials; safety evidence limited.
Effect sizes as reported
Standardised mean difference -0.59 (95% CI -0.75 to -0.42), I2 = 62%.
Why this rating
Low because only five trials were pooled, results differed moderately between trials (I2 62%), and long-term safety data are limited.
Form and dose studied
Amounts studied are in the studies table only.
Who was studied
Adults (18 and over), some with insomnia.
Limits
Five small trials; extracts differ; this is evidence for ashwagandha alone, not for blends.
Why researchers looked
Ashwagandha is an adaptogen herb traditionally taken for stress and tiredness, so trials checked its effect on sleep.
Traditional use
Ashwagandha (Withania somnifera) is a root used in Ayurvedic practice. A separate herb page covers it.
Proposed mechanism Not established
Not established.
A proposed mechanism does not show that the effect happens in people.
See the Safety tab for general cautions on herbal sleep products.
Melatonin for jet lag, delayed sleep timing and shift work
Low certaintyThese uses are for melatonin alone. NCCIH says melatonin may help with jet lag (reviews from 2010 and 2014) and delayed sleep-wake phase disorder, and that studies in shift workers were small or inconclusive. Blends were not tested for these uses.
1 studiesAmounts studied are in the studies table only.
Studies, doses and limits
What the trials found
NCCIH reports: for jet lag, four studies of 142 travelers found melatonin may beat placebo after eastward flights, and two studies of 90 travelers after westward flights; the evidence on sleep quality was low quality. For delayed sleep-wake phase disorder, a 2018 four-week trial in 307 people found melatonin taken before the desired bedtime plus a set bedtime meant falling asleep an average of 34 minutes earlier; the 2015 American Academy of Sleep Medicine recommendation was weak. For shift workers, two 2014 reviews were small or inconclusive.
Results
Promising but limited for jet lag and delayed sleep timing; inconclusive for shift work.
Effect sizes as reported
Delayed sleep timing trial: falling asleep about 34 minutes earlier (agency summary).
Why this rating
Low because these figures are from an agency summary of older and small reviews that were not re-read, and the evidence on sleep quality was called low quality.
Form and dose studied
Amounts studied are in the studies table only.
Who was studied
Travelers; people with delayed sleep timing; shift workers.
Limits
NCCIH page read, not the original reviews. Not tested in blends.
Why researchers looked
Melatonin signals darkness to the body clock, so it was tested for timing problems.
Traditional use
Melatonin is a hormone that helps time the 24-hour body clock (NCCIH).
Proposed mechanism Agency statement
Melatonin helps time circadian rhythms (agency statement). Not tested in blends.
A proposed mechanism does not show that the effect happens in people.
See the Safety tab for daytime drowsiness and label accuracy.
Melatonin and sleep in children
Low certaintyThis is for melatonin alone. A 2026 review of melatonin in young children found trials in 167 children with neurologic conditions improved sleep onset with few side effects, but no efficacy data for children with typical development. NCCIH says families should talk to a health care provider first.
2 studiesAmounts studied are in the studies table only.
Studies, doses and limits
What the trials found
Kracht 2026 reviewed 19 articles (12 observational studies, 6 trials and 1 protocol) to February 2025. Trials included 167 young children with neurologic conditions, lasting a mean of 12.7 weeks. They showed improved sleep onset with few adverse events. Long-term outcomes and efficacy in typically developing children were absent. Observational studies showed rising prescriptions, extended use and overdoses. NCCIH cites a 2019 review of 18 studies (1,021 children) in which melatonin shortened time to fall asleep and lengthened sleep, and warns that effects on puberty and hormones are not known.
Results
Short-term benefit in children with neurologic conditions; unknown for other children.
Effect sizes as reported
No plain-unit sizes in the abstracts read.
Why this rating
Low because trials were small and mostly in children with neurologic conditions; no efficacy data exist for typical development; study quality ranged from poor to good.
Form and dose studied
Amounts studied are in the studies table only.
Who was studied
Children, mostly with neurologic conditions such as autism.
Limits
Blends marketed to children were not tested.
Why researchers looked
Melatonin use in children has risen, so researchers reviewed what is known.
Traditional use
Parents and doctors use melatonin for sleep problems in children with conditions such as autism and ADHD (NCCIH).
Proposed mechanism Not established
Not established.
A proposed mechanism does not show that the effect happens in people.
See the Safety tab: accidental swallowing and label accuracy.
Kava, chamomile, tryptophan, 5-HTP and other add-ins
Not enough evidenceNCCIH says there is no conclusive evidence from clinical trials for chamomile, very little research on kava for insomnia (with liver injury concerns), and very limited data on tryptophan and 5-HTP. The 2017 American Academy of Sleep Medicine guideline recommended against tryptophan for chronic insomnia. Reviews for passionflower, lemon balm and oral GABA were not read for this page.
2 studiesAmounts studied are in the studies table only.
Studies, doses and limits
What the trials found
NCCIH sleep page: chamomile has traditionally been used for insomnia but there is no conclusive evidence, and people allergic to ragweed or related plants may react. Kava is said to have sedative properties but very little research has looked at insomnia. L-tryptophan and 5-hydroxytryptophan have sedative effects, but very limited data exist on insomnia, and the 2017 guideline recommended against tryptophan. NCCIH kava page: kava may help anxiety, and was linked to rare liver injury.
Results
Insufficient evidence for sleep. Kava also carries a liver-injury warning.
Effect sizes as reported
No sizes given in the pages read.
Why this rating
Insufficient because the sources read describe little or no research on these ingredients for sleep.
Form and dose studied
Amounts studied are in the studies table only.
Who was studied
Adults with insomnia (guideline context).
Limits
Agency pages only; no primary trials were read for these ingredients.
Why researchers looked
These ingredients are added to blends because they are traditionally calming or are building blocks of sleep chemicals.
Traditional use
Chamomile is a traditional tea; kava is a South Pacific drink; tryptophan and 5-HTP can be changed into melatonin in the body (NCCIH).
Proposed mechanism Agency statement
Tryptophan and 5-HTP can be changed into melatonin in the body (agency statement); this does not show they help sleep.
A proposed mechanism does not show that the effect happens in people.
Kava: serious liver injury has been reported. See the Safety tab.
Connections to the rest of health
How Sleep Blends (Melatonin, Magnesium, L-Theanine, Herbs) connects to the rest of our health knowledge graph. Every link says what kind of connection it is. A safety link (for example to the liver) is a warning, not a benefit. A study that merely mentions a topic never creates a benefit link.
Explore every connection: goals, body systems, organs, symptoms, genes
A. Wellness goals
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Better Sleep | Low certainty | Finished sleep blends: sleep quality and sleep disturbance: A few trials tested finished blends, and each tested a different mix. An 8-week trial in 43 older care-home residents found better sleep scores with a melatonin, magnesium and zinc mix than with placebo. A 4-week trial in 620 adults found one hops, valerian and low-THC mix beat placebo on self-rated sleep disturbance, while a second mix did not. A valerian and hops tablet gave only modest gains in 184 adults. Results from one mix cannot be carried over to another product. Melatonin (the most common blend ingredient): falling asleep in adults with insomnia: This result is for melatonin on its own, not for blends. A 2023 pooled review of 22 studies found prolonged-release melatonin shortened time to fall asleep by about 5 to 6 minutes in adults with insomnia. A 2022 review of 24 trials found melatonin did not clearly help adults with long-term insomnia, but might help children and teenagers. US and VA/DoD sleep guidelines recommended against it for chronic insomnia. | 20 11 17 21 9 15 6 14 1 19 2 22 28 | |
| Sleep Quality | Low certainty | Finished sleep blends: sleep quality and sleep disturbance: A few trials tested finished blends, and each tested a different mix. An 8-week trial in 43 older care-home residents found better sleep scores with a melatonin, magnesium and zinc mix than with placebo. A 4-week trial in 620 adults found one hops, valerian and low-THC mix beat placebo on self-rated sleep disturbance, while a second mix did not. A valerian and hops tablet gave only modest gains in 184 adults. Results from one mix cannot be carried over to another product. Valerian: sleep quality: Pooled reviews of valerian root disagree and are limited by weak trials. A 2006 review of 16 trials (1,093 people) found more people reporting better sleep, with signs of publication bias. A 2020 review of 60 studies said outcomes were inconsistent, possibly because extract quality varies. NCCIH says the evidence is inconsistent, and the 2017 American Academy of Sleep Medicine guideline recommended against valerian for chronic insomnia in adults. | 20 11 17 21 9 2 22 28 | |
| Fall Asleep Faster | Low certainty | Melatonin (the most common blend ingredient): falling asleep in adults with insomnia: This result is for melatonin on its own, not for blends. A 2023 pooled review of 22 studies found prolonged-release melatonin shortened time to fall asleep by about 5 to 6 minutes in adults with insomnia. A 2022 review of 24 trials found melatonin did not clearly help adults with long-term insomnia, but might help children and teenagers. US and VA/DoD sleep guidelines recommended against it for chronic insomnia. Magnesium: falling asleep and sleep quality: These results are for magnesium on its own. A 2021 pooled review of three small trials in 151 older adults found about 17 minutes less time to fall asleep with magnesium than placebo, but the trials were at moderate-to-high risk of bias and the evidence was low to very low quality. A 2022 review of 9 studies (7,582 people) found a link between magnesium status and sleep in observational studies but contradictory trial results. | 15 6 14 1 19 | |
| Sleep Quality | Low certainty | L-theanine: sleep quality: A 2025 pooled review of 19 randomised articles (897 people) found small improvements in self-rated time to fall asleep, daytime function and overall sleep quality with L-theanine. The authors point out that there were few trials of pure L-theanine; many tested mixes. | 4 | |
| Better Sleep | Low certainty | L-theanine: sleep quality: A 2025 pooled review of 19 randomised articles (897 people) found small improvements in self-rated time to fall asleep, daytime function and overall sleep quality with L-theanine. The authors point out that there were few trials of pure L-theanine; many tested mixes. Ashwagandha: sleep: Ashwagandha is added to some sleep blends. A 2021 pooled review of 5 randomised trials (400 people) found a small-to-moderate improvement in overall sleep with ashwagandha extract, larger in adults with insomnia and in trials of 8 weeks or more. The authors say safety data are limited. | 4 5 12 26 | |
| Circadian Rhythm Support | Low certainty | Melatonin for jet lag, delayed sleep timing and shift work: These uses are for melatonin alone. NCCIH says melatonin may help with jet lag (reviews from 2010 and 2014) and delayed sleep-wake phase disorder, and that studies in shift workers were small or inconclusive. Blends were not tested for these uses. | 26 | |
| Better Sleep | Not enough evidence | Kava, chamomile, tryptophan, 5-HTP and other add-ins: NCCIH says there is no conclusive evidence from clinical trials for chamomile, very little research on kava for insomnia (with liver injury concerns), and very limited data on tryptophan and 5-HTP. The 2017 American Academy of Sleep Medicine guideline recommended against tryptophan for chronic insomnia. Reviews for passionflower, lemon balm and oral GABA were not read for this page. | 27 25 |
B. Body systems
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Sleep Recovery | Biological association | Low certainty | Studied for: Finished sleep blends: sleep quality and sleep disturbance Studied for: Melatonin (the most common blend ingredient): falling asleep in adults with insomnia | 20 11 17 21 9 15 6 14 1 19 4 2 22 28 5 26 12 27 25 |
E. Health conditions
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Insomnia | Preliminary | Evidence for finished blends is limited; melatonin results are mixed; guidelines recommended against melatonin and valerian for chronic insomnia. Few finished blends were tested; melatonin results are mixed and guidelines recommended against it for chronic insomnia. Preparation or compound: Sleep blends and melatonin |
15 6 27 | |
| Herb-related liver injury | Adverse effect or risk | Case report | Kava and, rarely, valerian have been linked to liver injury. Preparation or compound: Kava; valerian-containing blends |
25 10 23 |
I. Biomarkers
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Time to fall asleep | Biological association | Low certainty | Measured in trials: a few minutes shorter in pooled melatonin trials. A lab change is not the same as a health benefit. | 15 6 |
| Sleep quality and sleep disturbance scores | Biological association | Low certainty | Measured in trials: better in two of the blend trials; modest or not different in others. A lab change is not the same as a health benefit. | 20 11 17 |
| Time to fall asleep (magnesium trials) | Biological association | Very low certainty | Measured in trials: shorter in a small pooled analysis. A lab change is not the same as a health benefit. | 14 |
| Self-rated sleep quality (L-theanine trials) | Biological association | Low certainty | Measured in trials: small improvement in self-rated scores. A lab change is not the same as a health benefit. | 4 |
K. Biological pathways
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Magnesium | Preliminary mechanism | Human | Mineral tested alone for sleep in older adults; has its own page. | 14 |
| L-theanine | Preliminary mechanism | Human | Amino acid tested for sleep quality; has its own page. | 4 |
| Zinc | Preliminary mechanism | Human | Part of the melatonin, magnesium and zinc blend trial. | 20 |
L. Active compounds
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Melatonin | Biological association | Human | The usual lead ingredient. A hormone that helps time the body clock; made synthetically in most supplements (NCCIH). | 26 15 |
| Magnesium (citrate, glycinate, oxide and other salts) | Biological association | Human | Added for relaxation. Tested alone for sleep in older adults with low-quality results. | 14 1 |
| L-theanine | Biological association | Human | Added for calm. Small self-rated sleep gains in pooled trials, many with mixed products. | 4 |
| Valerian root extract | Biological association | Human | A traditional sleep herb. Trial results inconsistent; extract quality varies. Preparation or compound: Root or flowering parts (extract); not read in detail |
2 22 28 |
| Hops extract or oil | Biological association | Human | Tested together with valerian in blend trials; not tested alone in the sources read. Preparation or compound: Root or flowering parts (extract); not read in detail |
17 11 21 |
| Ashwagandha extract | Biological association | Human | A root used in Ayurveda; small pooled benefit for sleep in 5 trials. Preparation or compound: Root or flowering parts (extract); not read in detail |
5 |
| Kava | Biological association | Human | Said to be sedating. Linked to rare serious liver injury. Preparation or compound: Root or flowering parts (extract); not read in detail |
25 23 |
| Chamomile | Biological association | Human | Traditional sleep tea; no conclusive trial evidence (NCCIH). Preparation or compound: Root or flowering parts (extract); not read in detail |
27 |
| L-tryptophan and 5-HTP | Biological association | Human | Can be changed into melatonin in the body. A guideline recommended against tryptophan for chronic insomnia. | 27 |
| Zinc | Biological association | Human | Appeared together with melatonin and magnesium in one blend trial (43 people). | 20 |
| Passionflower, lemon balm and oral GABA | Biological association | Listed only | Commonly listed on blend labels. No review was read for this page. | 30 |
Each connection is stored with the ingredient, the connected record, the kind of connection, the evidence status, the supporting studies, the preparation or compound involved, and a review date (last reviewed October 26, 2026).
Evidence at a glance: what the research found for 9 outcomes
Each outcome below is one thing researchers measured. Certainty is how far the evidence can be trusted, not how well it works. The full studies are on the next tab.
The evidence
The research centre for Sleep Blends (Melatonin, Magnesium, L-Theanine, Herbs). Every record here was checked against PubMed or the publisher's page; we never list a study we have not verified.
Evidence by outcome
Bars show how many studies we found for each outcome, not how well it works. People are added up across trials only (reviews are not added, to avoid double counting).
How we rate evidence
High certainty
Several well-run trials or reviews agree; further research is unlikely to change the picture much.
Moderate certainty
Good trials point the same way, but some doubt remains.
Low certainty
Small, short or inconsistent trials. The finding could change with better research.
Very low certainty
Very little or very weak human data. Treat as a possibility only.
Mixed findings
Trials or reviews disagree with each other.
Not enough evidence
Not enough human research to say either way.
Evidence against
Good research found no benefit, or found harm.
We take the reviewers' own risk-of-bias and GRADE statements where they exist, and otherwise judge from study size, design, consistency, directness and whether a product matches what is sold. Many publications do not make evidence high. Method note: We started from our existing sleep-blend summary, then re-read the PubMed abstracts of every review, trial, case report and lab study cited, and read the NCCIH melatonin, sleep disorders, valerian and kava pages on 2026-10-26. Only abstracts and agency pages were read. The NIH ODS magnesium page was blocked and is marked unverified.
Study library: every study we checked 30
| Study | Design | People | Product, dose, length | Result |
|---|---|---|---|---|
| Arab 2023 The Role of Magnesium in Sleep Health: a Systematic Review of Available Literature. Biol Trace Elem Res · PMID 35184264 · DOI |
Systematic review |
7582 9 cross-sectional, cohort and randomised studies in adults (7,582 people) |
Dietary magnesium or magnesium supplements Oral Varied Varied · vs Low intake or placebo |
Observational studies linked magnesium status with sleep quality. Randomised trials gave contradictory results and an uncertain link between supplements and sleep disorders. Not given in the abstract (Not given in the abstract) Methods, limits and fundingOutcomes: Sleep duration, onset, awakenings, daytime sleepiness, snoring Limitations: Mixed study types; observational links do not show cause; longer trials (over 12 weeks) are needed. Funding and conflicts: No conflict statement in the abstract. Read: abstract |
| Bent 2006 Valerian for sleep: a systematic review and meta-analysis. Am J Med · PMID 17145239 · DOI |
Systematic review meta analysis |
1093 16 randomised placebo-controlled trials, 1,093 patients |
Valerian root extracts Oral Varied widely Varied · vs Placebo |
6 studies reported a yes/no outcome and showed a benefit, but with publication bias. Most studies had significant methodological problems. Relative risk of improved sleep 1.8 (95% CI 1.2 to 2.9) Methods, limits and fundingOutcomes: Sleep quality (improved or not) Limitations: Publication bias; very different doses and preparations; the review dates from 2006. Funding and conflicts: Research support, N.I.H., per PubMed. Read: abstract |
| Besag 2019 Adverse Events Associated with Melatonin for the Treatment of Primary or Secondary Sleep Disorders: A Systematic Review. CNS Drugs · PMID 31722088 · DOI |
Systematic review |
37 randomised placebo-controlled trials of melatonin for primary or secondary sleep disorders | Melatonin Oral 0.15 mg to 12 mg a day (studied in trials) Mostly 4 weeks or less; up to 29 weeks · vs Placebo |
Most common events: daytime sleepiness 1.66%, headache 0.74%, other sleep-related events 0.74%, dizziness 0.74%, hypothermia 0.62%. Few serious events; agitation, mood swings, nightmares, palpitations and skin irritation were reported. Daytime sleepiness 1.66% (Not applicable) Methods, limits and fundingOutcomes: Types and frequency of adverse events Limitations: Short trials; long-term use not covered. Funding and conflicts: No conflict statement in the abstract. Read: abstract |
| Bulman 2025 The effects of L-theanine consumption on sleep outcomes: A systematic review and meta-analysis. Sleep Med Rev · PMID 40056718 · DOI |
Systematic review meta analysis |
897 19 randomised trials (897 people), all ages and health status; 18 pooled |
L-theanine Oral Varied; the review says the right amount and duration are unknown Varied · vs Placebo |
Small gains in self-rated time to fall asleep, daytime dysfunction and sleep quality. SMD 0.15 (time to fall asleep); 0.33 (daytime dysfunction); 0.43 (sleep quality) (0.01 to 0.29; 0.16 to 0.49; 0.04 to 0.83) Methods, limits and fundingOutcomes: Self-rated time to fall asleep, daytime dysfunction, sleep quality Limitations: Few trials of pure L-theanine; self-rated outcomes; wide interval for sleep quality. Funding and conflicts: Research support, non-U.S. government, per PubMed; no conflict statement in the abstract. Read: abstract |
| Cheah 2021 Effect of Ashwagandha (Withania somnifera) extract on sleep: A systematic review and meta-analysis. PLoS One · PMID 34559859 · DOI |
Systematic review meta analysis |
400 5 randomised placebo-controlled trials in adults 18 and over |
Ashwagandha (Withania somnifera) extract Oral Varied; effect larger in higher-amount and longer trials per the review 8 weeks or more showed larger effects · vs Placebo |
Small-to-moderate improvement in overall sleep, larger in adults with insomnia. Anxiety and morning alertness improved; quality of life did not. No serious side effects reported. SMD -0.59 (95% CI -0.75 to -0.42; I2 = 62%) Methods, limits and fundingOutcomes: Sleep quantity and quality; alertness on rising; anxiety; quality of life Limitations: Five trials; long-term safety data limited. Funding and conflicts: No conflict statement in the abstract. Read: abstract |
| Choi 2022 Efficacy of melatonin for chronic insomnia: Systematic reviews and meta-analyses. Sleep Med Rev · PMID 36179487 · DOI |
Systematic review meta analysis |
24 randomised trials of melatonin versus placebo in chronic insomnia, including 4 in people with other illnesses | Melatonin Oral Varied by study Varied · vs Placebo |
In adults without other illness melatonin was not significantly effective; in children and teenagers it was. In people with other illnesses it shortened time to fall asleep in all age groups, but only one adult study was included. Not given in the abstract (Not given in the abstract) Methods, limits and fundingOutcomes: Time to fall asleep, total sleep time, sleep efficiency, sleep quality, quality of life Limitations: Results differed a lot between studies; the authors say more studies are needed by age group. Funding and conflicts: Research support, non-U.S. government, per PubMed; no conflict statement in the abstract. Read: abstract |
| Cohen 2023 Quantity of Melatonin and CBD in Melatonin Gummies Sold in the US. JAMA · PMID 37097362 · DOI |
Laboratory analysis n/a (product analysis) |
Melatonin gummies sold in the US | Melatonin gummies (not blends) Oral · vs Label claim |
The research letter compares measured melatonin and CBD in gummies with label quantities. No abstract or numbers could be read; numbers in this page come from NCCIH's description of a 2023 study. Not read (Not read) Methods, limits and fundingOutcomes: Measured melatonin and CBD against label quantities Limitations: Abstract not available; authors disclose research support from Consumers Union and PEW Charitable Trusts. Funding and conflicts: Authors' disclosures were read in the PubMed Central record: research support from Consumers Union and PEW Charitable Trusts; one author coordinates a conference supported by supplement companies. Read: title-only |
| Erland 2017 Melatonin Natural Health Products and Supplements: Presence of Serotonin and Significant Variability of Melatonin Content. J Clin Sleep Med · PMID 27855744 · DOI |
Laboratory analysis n/a (product analysis) |
31 31 commercial melatonin supplements (grocery stores and pharmacies), different brands and forms |
Melatonin supplements (not blends) Oral · vs Label claim |
Melatonin ranged from -83% to +478% of the label, up to 465% between lots. More than 71% did not meet the label within 10%, and eight contained serotonin at 1 to 75 micrograms. Melatonin -83% to +478% of label (Not applicable) Methods, limits and fundingOutcomes: Melatonin and serotonin content by liquid chromatography Limitations: Small sample of one point in time; single-ingredient products. Funding and conflicts: No conflict statement in the abstract. Read: abstract |
| Gong 2026 Walnut peptide and theanine combination ameliorates sleep disorders: a multi-species study including a human trial. Food Funct · PMID 41531275 · DOI |
Randomised controlled trial human and animal |
Zebrafish and mouse models, plus an 8-week human trial in adults with sleep disturbance (PSQI 7 or more) | Walnut peptide plus theanine combination Oral 8 weeks (human trial) · vs Placebo |
The abstract says the combination restored sleep duration and improved sleep quality scores in the human trial. It gives no human numbers. Most of the report is animal and zebrafish work. Not given in the abstract (Not given in the abstract) Methods, limits and fundingOutcomes: Pittsburgh Sleep Quality Index; sleep duration; animal sleep architecture Limitations: Number of people and effect sizes not in the abstract; mostly animal data; a food-ingredient combination, not a typical sleep blend. Funding and conflicts: Funding not stated in the abstract. Read: abstract |
| Koenig 2021 Acute Liver Injury After Long-Term Herbal "Liver Cleansing" and "Sleep Aid" Supplement Use. J Emerg Med · PMID 33579656 · DOI |
Case report |
1 A 53-year-old woman with jaundice after a month of an herbal liver-cleansing product and a nightly herbal sleep aid containing valerian |
Combination herbal products Oral About 1 month |
Cholestatic jaundice with liver injury consistent with drug-induced liver injury; improved after stopping both products and a steroid course. Not applicable (Not applicable) Methods, limits and fundingOutcomes: Liver enzymes, imaging, liver biopsy Limitations: One case; two products with many ingredients, so the cause cannot be tied to valerian. Funding and conflicts: No conflict statement in the abstract. Read: abstract |
| Kolobaric 2023 A Randomized, Double-Blind, Placebo-Controlled Decentralized Trial to Assess Sleep, Health Outcomes, and Overall Well-Being in Healthy Adults Reporting Disturbed Sleep, Taking a Melatonin-Free Supplement. Nutrients · PMID 37686820 · DOI |
Randomised controlled trial |
620 620 adults seeking better sleep (healthy, reporting disturbed sleep), decentralised online trial |
Two melatonin-free multi-ingredient products: Sleep A (hops oil 75 mg, valerian oil 75 mg, THC 0.35 mg) and Sleep B (hops oil 20 mg, valerian oil 20 mg, THC 0.85 mg) Oral As listed under substance (studied in the trial) 4 weeks · vs Placebo |
Sleep A differed from placebo on sleep disturbance, anxiety, stress and well-being. Sleep B did not differ from placebo on any measure. Side effects were mild or moderate and not different between groups. Significant difference for Sleep A only (sizes not given in the abstract) (Not given in the abstract) Methods, limits and fundingOutcomes: PROMIS Sleep Disturbance (self-rated); anxiety, stress, pain and well-being Limitations: Online, self-rated; healthy volunteers rather than people with insomnia; the products contain THC, so results do not apply to melatonin or magnesium blends. Funding and conflicts: Funding and company links not stated in the abstract. Read: abstract |
| Kracht 2026 Melatonin Use in Young Children: A Systematic Review. JAMA Netw Open · PMID 41481289 · DOI |
Systematic review |
167 19 articles: 12 observational studies, 6 trials (167 young children with neurologic conditions) and 1 protocol |
Melatonin Oral Varied Mean 12.7 weeks in trials (2 weeks to 2 years) · vs Varied |
Trials showed improved sleep onset in young children with neurologic conditions, with few adverse events. Observational studies showed rising prescribing, extended use and overdoses. No efficacy data for children with typical development; long-term outcomes absent. Not given in the abstract (Not given in the abstract) Methods, limits and fundingOutcomes: Safety and effectiveness of melatonin on sleep in young children Limitations: Methodological quality poor for 3 studies, fair for 9, good for 6; mostly children with neurologic conditions. Funding and conflicts: Research support, non-U.S. government, per PubMed. Read: abstract |
| Lelak 2022 Pediatric Melatonin Ingestions - United States, 2012-2021. MMWR Morb Mortal Wkly Rep · PMID 35653284 · DOI |
Surveillance report |
260435 People aged 19 or younger with isolated melatonin ingestions reported to US poison centres, 2012 to 2021 |
Melatonin ingestions (mostly unintentional in children 5 and under) Oral 10 years |
260,435 reports; yearly reports rose 530%. Hospitalizations and serious outcomes rose, mostly from unintentional ingestion in children 5 and under. Five children needed mechanical ventilation and two died. 530% increase in yearly reports (Not applicable) Methods, limits and fundingOutcomes: Number of ingestions, hospitalizations, serious outcomes Limitations: Reports to poison centres, not a count of all cases; melatonin only; sleep blends not separated. Funding and conflicts: Public health surveillance report. Read: abstract |
| Mah 2021 Oral magnesium supplementation for insomnia in older adults: a Systematic Review & Meta-Analysis. BMC Complement Med Ther · PMID 33865376 · DOI |
Systematic review meta analysis |
151 3 randomised trials in older adults with insomnia, three countries |
Oral magnesium Oral Less than 1 g quantities up to three times a day per the review (studied in trials) Varied · vs Placebo or no treatment |
Time to fall asleep 17.36 minutes shorter; total sleep time 16.06 minutes longer, not significant. All trials at moderate-to-high risk of bias; evidence low to very low quality. Time to fall asleep -17.36 min (95% CI -27.27 to -7.44) Methods, limits and fundingOutcomes: Sleep quality, sleep quantity, adverse events Limitations: Three small trials; high risk of bias; older adults only. Funding and conflicts: No conflict statement in the abstract. Read: abstract |
| Maruani 2023 Efficacy of melatonin and ramelteon for the acute and long-term management of insomnia disorder in adults: A systematic review and meta-analysis. J Sleep Res · PMID 37434463 · DOI |
Systematic review meta analysis |
4875 22 studies, 4,875 adults with insomnia disorder (925 melatonin, 1,804 ramelteon, 2,297 placebo) |
Melatonin (mostly prolonged-release) and ramelteon, a prescription drug Oral Varied by study Acute and long-term · vs Placebo |
Prolonged-release melatonin beat placebo with small to medium effect sizes on time to fall asleep and measured sleep efficiency. Ramelteon, a drug, had larger effects. Effects were larger when average age was 55 or more. Self-rated time to fall asleep -6.30 min; measured -5.05 min; sleep efficiency +1.91 points (Not given in the abstract) Methods, limits and fundingOutcomes: Self-rated and measured sleep onset, total sleep time, sleep efficiency Limitations: Mixes melatonin with a prescription drug in one review; most studies tested prolonged-release melatonin; the authors call the level of evidence low. Funding and conflicts: No conflict statement in the abstract. Read: abstract |
| Menczel Schrire 2022 Safety of higher doses of melatonin in adults: A systematic review and meta-analysis. J Pineal Res · PMID 34923676 · DOI |
Systematic review meta analysis |
3861 79 randomised trials (3,861 adults over 30) of melatonin at 10 mg or more |
High-dose melatonin Oral 10 mg or more (studied in trials) Varied · vs Placebo or control |
In four low-risk-of-bias studies, serious events and withdrawals were not detectably higher, but drowsiness, headache and dizziness were more common (rate ratio 1.40). 37% of studies did not mention side effects. Adverse events rate ratio 1.40 (95% CI 1.15 to 1.69) Methods, limits and fundingOutcomes: Adverse events, serious adverse events, withdrawals Limitations: Side-effect reporting was poor; wide confidence limits; high-dose melatonin only. Funding and conflicts: No conflict statement in the abstract. Read: abstract |
| Morin 2005 Valerian-hops combination and diphenhydramine for treating insomnia: a randomized placebo-controlled clinical trial. Sleep · PMID 16335333 · DOI |
Randomised controlled trial |
184 184 adults with mild insomnia at 9 US sleep centres |
Valerian and hops combination tablets, or diphenhydramine, or placebo Oral Valerian extract 187 mg plus hops extract 41.9 mg per two tablets nightly (studied in the trial) 28 days (diphenhydramine 14 days then placebo 14 days) · vs Placebo |
Modest gains in self-rated sleep with both valerian-hops and diphenhydramine, but few comparisons with placebo were significant. No group difference on any polysomnography sleep-continuity measure. Not given in the abstract (Not given in the abstract) Methods, limits and fundingOutcomes: Sleep diaries; polysomnography; insomnia severity; quality of life Limitations: Mild insomnia only; a branded extract combination; the abstract notes few significant differences. Funding and conflicts: Research support, non-U.S. government, per PubMed; no conflict statement in the abstract. Read: abstract |
| Pawar 2025 A Survey of Melatonin in Dietary Supplement Products Sold in the United States. Drug Test Anal · PMID 39482109 · DOI |
Laboratory analysis n/a (product analysis) |
110 110 dietary supplement products labeled to contain melatonin and marketed towards children |
Melatonin products (not blends) Oral Median 1.7 mg per serving, range 0.042 to 50 mg per serving (measured) · vs Label claim |
Melatonin was found in 108 of 110 products (98%), at 0% to 667% of the label declaration. 0% to 667% of label (Not applicable) Methods, limits and fundingOutcomes: Melatonin and breakdown products by LC-MS/MS Limitations: Marketed-to-children products only; product stability not fully explained. Funding and conflicts: No conflict statement in the abstract. Read: abstract |
| Rawji 2024 Examining the Effects of Supplemental Magnesium on Self-Reported Anxiety and Sleep Quality: A Systematic Review. Cureus · PMID 38817505 · DOI |
Systematic review |
15 interventional trials (8 sleep, 7 anxiety, 1 both) from 860 records, PubMed only | Oral magnesium supplements Oral At least 50 mg magnesium per dose per review criteria; formulations with more than 3 other active compounds excluded Varied · vs Varied |
5 of 8 sleep studies reported improvements, 2 reported none and 1 mixed. Conclusions limited by varied data and small groups. Not given in the abstract (Not given in the abstract) Methods, limits and fundingOutcomes: Sleep quality (mostly PSQI); anxiety scores Limitations: Searched PubMed only; heterogeneous; small studies. Funding and conflicts: No conflict statement in the abstract. Read: abstract |
| Rondanelli 2011 The effect of melatonin, magnesium, and zinc on primary insomnia in long-term care facility residents in Italy: a double-blind, placebo-controlled clinical trial. J Am Geriatr Soc · PMID 21226679 · DOI |
Randomised controlled trial |
43 43 people with primary insomnia in one long-term care facility in Italy (22 supplement, 21 placebo), average age about 78 |
Melatonin, magnesium and zinc food supplement mixed with pear pulp Oral 5 mg melatonin, 225 mg magnesium and 11.25 mg zinc in 100 g pear pulp, 1 hour before bed (studied in the trial) 8 weeks · vs Pear pulp placebo |
Overall sleep quality score was much better with the supplement than placebo (difference between groups in change 6.8 points). Ease of getting to sleep, quality of sleep, morning alertness, total sleep time and the physical quality-of-life score also improved. Difference between groups in PSQI change 6.8 points; total sleep time improved (p<.001) (95% CI 5.4 to 8.3) Methods, limits and fundingOutcomes: Sleep quality (Pittsburgh Sleep Quality Index); Leeds Sleep Evaluation; total sleep time by wrist sensor; quality of life Limitations: Small trial in one care home; older people only; one product, so the ingredients cannot be separated; long-term safety not studied. Funding and conflicts: Funding not stated in the abstract. Read: abstract |
| Schicktanz 2025 Effects of a Valerian-Hops Extract Combination (Ze 91019) on Sleep Duration and Daytime Cognitive and Psychological Parameters in Occasional Insomnia: A Randomized Controlled Feasibility Trial. Brain Behav · PMID 40462685 · DOI |
Randomised controlled trial |
40 40 people with occasional sleep problems |
Valerian and hops extract combination (Ze 91019) Oral 21-day run-in then 21-day treatment · vs Placebo |
Feasibility trial: exploratory analyses showed about 21.7 minutes more sleep a day with the extract (p = 0.019) and no effect on daytime thinking or mood. Well tolerated. +21.7 minutes sleep per day (exploratory) (Not given in the abstract) Methods, limits and fundingOutcomes: Sleep duration by Fitbit tracker; daytime reaction time, working memory and mood Limitations: Feasibility design, 40 people, exploratory analysis, one branded extract. Funding and conflicts: Funding not stated in the abstract. Read: abstract |
| Shinjyo 2020 Valerian Root in Treating Sleep Problems and Associated Disorders-A Systematic Review and Meta-Analysis. J Evid Based Integr Med · PMID 33086877 · DOI |
Systematic review meta analysis |
6894 60 studies (6,894 people); pooled sleep quality used 10 studies (1,065 people) and anxiety used 8 studies (535 people) |
Valerian root Oral Varied Varied · vs Varied |
The authors say inconsistent outcomes were possibly due to variable extract quality, with more reliable effects from whole root, and no severe adverse events in people aged 7 to 80. They concluded valerian could be safe and effective; the abstract gives no pooled numbers. Not given in the abstract (Not given in the abstract) Methods, limits and fundingOutcomes: Subjective sleep quality; anxiety; adverse events Limitations: The abstract's conclusion is stronger than NCCIH and guideline views; quality of studies varied; no pooled numbers in the abstract. Funding and conflicts: No conflict statement in the abstract. Read: abstract |
| Teschke 2010 Kava hepatotoxicity--a clinical review. Ann Hepatol · PMID 20720265 |
Clinical review |
14 14 patients worldwide with suspected kava liver disease |
Kava products (aqueous, ethanol and acetone extracts, and mixtures) Oral |
Causality was highly probable in 1, probable in 4 and possible in 9. Risk factors: overdose, prolonged treatment, other drugs and supplements; poor raw material quality may contribute. Not applicable (Not applicable) Methods, limits and fundingOutcomes: Causality assessment of kava liver injury Limitations: Case-based; no rates; authors suggest raw material quality as a factor. Funding and conflicts: No conflict statement in the abstract. Read: abstract |
| s-label-terms General explanation of supplement label wording (editorial) |
Internal summary n/a |
Methods, limits and fundingRead: summary-only | ||
| s-nccih-kava NCCIH: Kava (page read 2026-10-26) · Source |
Agency page n/a |
Methods, limits and fundingRead: page | ||
| s-nccih-melatonin NCCIH: Melatonin - What You Need To Know (page read 2026-10-26) · Source |
Agency page n/a |
Methods, limits and fundingRead: page | ||
| s-nccih-sleep NCCIH: Sleep Disorders and Complementary Health Approaches (page read 2026-10-26) · Source |
Agency page n/a |
Methods, limits and fundingRead: page | ||
| s-nccih-valerian NCCIH: Valerian (page read 2026-10-26) · Source |
Agency page n/a |
Methods, limits and fundingRead: page | ||
| s-ods-magnesium NIH Office of Dietary Supplements: Magnesium fact sheet (could not be read) · Source |
Agency page n/a |
Methods, limits and fundingRead: not-read | ||
| s-site-summary Existing AlternativeMed sleep blends summary (read 2026-10-26) |
Internal summary n/a |
Methods, limits and fundingRead: summary-only |
What we do not know yet
- No trial of the melatonin, magnesium and L-theanine type of blend was read.
- No head-to-head trial of a blend against its separate ingredients was read.
- No survey of label accuracy or hidden ingredients in multi-ingredient sleep blends was read.
- No review for passionflower, lemon balm or oral GABA was read.
- The NIH Office of Dietary Supplements magnesium page could not be read, and FDA pages were not opened.
- The JAMA melatonin and CBD gummy letter had no abstract, so its numbers are not stated.
- Label rules for proprietary blends and Daily Value were not read from an official source.
How new research is added
New studies are found by a saved PubMed search and placed in a review queue before the page changes.
Lab markers
What changed in blood or saliva tests during trials. A changed number is not the same as feeling or being healthier, and we give no "normal ranges".
Other 4
Time to fall asleep
A few minutes shorter in pooled melatonin trials in trials
How many minutes it takes to fall asleep after lights out, either reported by the person or measured by a sleep test.
Low certaintyResults and what it means
Why it was measured
To see whether a sleep product helps people drift off sooner.
Statistical vs. clinical meaning
A few minutes; the two reviews do not agree for adults.
Safety implication
Drowsiness the next day can occur. See the Safety tab.
| Study | Result | People | Product |
|---|---|---|---|
| 15 | Prolonged-release melatonin: 6.30 minutes shorter (self-rated) and 5.05 minutes shorter (measured) than placebo | 22 studies, 4,875 people with insomnia disorder (melatonin and ramelteon) | Melatonin alone |
| 6 | Not significantly shorter in adults without other illness; shorter in children and teenagers | 24 randomised trials in chronic insomnia | Melatonin alone |
Sleep quality and sleep disturbance scores
Better in two of the blend trials; modest or not different in others in trials
Questionnaires where people rate how well they sleep. Examples are the Pittsburgh Sleep Quality Index and the PROMIS Sleep Disturbance scale.
Low certaintyResults and what it means
Why it was measured
To see whether people feel they sleep better with a finished blend.
Statistical vs. clinical meaning
Self-rated scores; each result belongs to one product.
Safety implication
No extra side effects than placebo were reported in the 620-person trial.
| Study | Result | People | Product |
|---|---|---|---|
| 20 | Sleep quality score better than placebo (difference 6.8 points, 95% CI 5.4 to 8.3) | 43 older care-home residents with primary insomnia | Melatonin, magnesium and zinc food supplement for 8 weeks |
| 11 | Sleep disturbance score better than placebo with one mix; no difference with the other | 620 adults wanting better sleep | Hops oil, valerian oil and low-dose THC mixes for 4 weeks |
| 17 | Modest gains; few comparisons with placebo significant | 184 adults with mild insomnia | Valerian and hops tablets for 28 days |
Time to fall asleep (magnesium trials)
Shorter in a small pooled analysis in trials
How many minutes it takes to fall asleep after lights out.
Very low certaintyResults and what it means
Why it was measured
To see whether magnesium helps older adults with insomnia drift off sooner.
Statistical vs. clinical meaning
A result from three trials at moderate-to-high risk of bias.
Safety implication
Diarrhea and cramps can occur with high amounts.
| Study | Result | People | Product |
|---|---|---|---|
| 14 | 17.36 minutes shorter than placebo (95% CI -27.27 to -7.44) | 3 trials, 151 older adults with insomnia | Oral magnesium |
Self-rated sleep quality (L-theanine trials)
Small improvement in self-rated scores in trials
Questionnaire scores where people rate how well they slept.
Low certaintyResults and what it means
Why it was measured
To see whether L-theanine changes how people feel they sleep.
Statistical vs. clinical meaning
Self-rated, small effects, often not pure L-theanine.
Safety implication
None described in the abstract.
| Study | Result | People | Product |
|---|---|---|---|
| 4 | Overall sleep quality SMD 0.43 (95% CI 0.04 to 0.83), 12 studies; time to fall asleep SMD 0.15; daytime dysfunction SMD 0.33 | 19 randomised articles, 897 people | L-theanine, often with other ingredients |
Safety
What studies and official sources say about side effects, medicines and who should check first. Each point shows what kind of evidence it comes from.
Main points to know 4
- Melatonin amounts on labels often do not match what is in the product. A 2017 test of 31 melatonin supplements found melatonin ranged from 83% below to 478% above the label, and varied by up to 465% between lots of the same product. More than 71% did not match the label within 10%, and eight contained serotonin. A 2025 test of 110 melatonin products marketed for children found melatonin from 0% to 667% of the label amount. NCCIH reports a 2023 study in which 22 of 25 melatonin gummies were inaccurately labeled, with melatonin from none detected to 347% of the label. These tests were of melatonin products; no survey of multi-ingredient sleep blends was read, so the same cannot be assumed or ruled out for blends. Laboratory analysis 8 18 7 26
- Children can swallow sleep gummies by accident, and poison centres see many cases. US poison centres received 260,435 reports of melatonin swallowed by people 19 and under from 2012 to 2021, a 530% rise. Most serious outcomes involved unintentional swallowing by children 5 and under. Five children needed a breathing machine and two died. NCCIH, citing a 2024 CDC report, says about 11,000 emergency visits from 2019 to 2022 were for unsupervised melatonin swallowing by children 5 and under, many involving flavoured products such as gummies. Keep all sleep products out of children's reach. Poison centre surveillance data 13 26
- Kava has been linked to serious, sometimes fatal liver injury; valerian rarely. NCCIH says kava products have been linked to rare cases of liver injury, some serious or even fatal. A clinical review of 14 patients found causality probable or possible in most; risk factors included overdose, prolonged use and taking other drugs or supplements. NCCIH says liver injury with valerian was reported in very rare cases, most often in combination with other herbs. A case report describes a 53-year-old woman with jaundice after a month of a valerian-containing sleep aid plus a liver-cleansing herbal product. The case cannot show which product or ingredient was responsible. Agency statement, clinical review and case report 25 23 28 10
- Sleep ingredients can add up: drowsiness, alcohol and other sedatives. A blend may contain several sleep-promoting ingredients at once. NCCIH says valerian should not be taken with alcohol or sedatives because it might add to sleepiness (possible, not proven), and kava should not be used with benzodiazepines or alcohol. Melatonin may stay active longer in older adults and cause daytime drowsiness. Magnesium from supplements and medicines has an official upper limit (see Regulators). The same ingredient can also appear in more than one product you take. Agency statement 28 25 26 27
Side effects 6
| Effect | How often | Severity and recovery | Evidence |
|---|---|---|---|
| Daytime sleepiness, headache, dizziness (melatonin) Most trials lasted 4 weeks or less. | Daytime sleepiness 1.66%, headache 0.74%, dizziness 0.74% across 37 trials | Mostly mild Most reported effects resolved on their own, per the review abstract | Systematic review 3 |
| Drowsiness, headache and dizziness with melatonin of 10 mg or more in adults Serious events and withdrawals were not detectably higher, but 37% of the 79 studies did not report side effects at all. | Rate ratio 1.40 (95% CI 1.15 to 1.69) in four low-risk-of-bias studies | Mild Not stated in the abstract | Meta-analysis 16 |
| Diarrhea, nausea and cramping from high magnesium intake NCCIH: high intakes from supplements and medicines can cause diarrhea, nausea and abdominal cramping. | Not given | Mild to moderate; extremely high intakes can disturb heart rhythm Not stated | Agency statement 27 |
| Headache, stomach upset, mental dullness, vivid dreams (valerian) Long-term safety is unknown. | Not given | Mild Withdrawal symptoms such as anxiety and insomnia are possible if stopped abruptly after chronic use (NCCIH) | Agency statement 28 |
| Digestive upset, headache, dizziness (kava); dry scaly skin with long high use Liver injury is covered under Key safety. | Not given | Mild to moderate; liver injury can be severe Not stated | Agency statement 25 |
| Mild or moderate side effects in a 620-person trial of hops, valerian and low-dose THC mixes Short trial (4 weeks); one mix contains THC. | Not different from placebo | Mild or moderate Not stated | Randomised trial 11 |
Liver
Kava is linked to serious liver injury in rare cases and valerian to very rare cases, mostly when combined with other herbs (NCCIH). Sleep blends that contain either herb therefore carry this warning. Frequency was not found. 25 28 10 23
How often. No rate was found in the sources read.
Monitoring. No agency monitoring advice was found in the pages read. Ask a doctor about liver tests if you have liver disease or take liver-affecting medicines.
- .
- .
This is a safety connection. It is not evidence that Sleep Blends (Melatonin, Magnesium, L-Theanine, Herbs) supports liver health.
Medicines and supplements 5
| With | Why it matters | Importance | Evidence | What to do |
|---|---|---|---|---|
| Blood thinners and epilepsy medicines (melatonin) prescription | Not described in the page read. | NCCIH says people with epilepsy and people taking blood thinners need medical supervision when taking melatonin. | Agency statement Low certainty 26 | Ask a doctor or pharmacist before taking a melatonin-containing blend. |
| Alcohol and sedatives (valerian, kava) prescription | Possible added sleepiness (valerian); kava has sedative effects (NCCIH). | NCCIH says valerian should not be taken with alcohol or sedatives (possible, not proven), and kava should not be used with benzodiazepines or alcohol. | Agency statement Low certainty 28 25 | Ask a doctor or pharmacist before combining these with sleeping pills, sedatives or alcohol. |
| Other sleep products and the same ingredient in more than one product supplement | Amounts add up. Magnesium, melatonin and herbs can appear in several products. | NCCIH advises caution about combining sleep products and says to find out about risks from long-term use or combining products. It also gives an upper limit for magnesium from supplements and medicines (see Regulators). | Agency statement Low certainty 27 | Tell a doctor or pharmacist about every sleep product you use. |
| Medicines that affect serotonin (tryptophan, 5-HTP) prescription | Not found in the pages read. | An earlier summary said NCCIH warns of serotonin toxicity. That warning was not found in the NCCIH pages read for this page, so it is not stated here. | Absence of evidence in sources read Not enough evidence 27 | Ask a pharmacist, because absence in the pages read is not proof of safety. |
| Prescription medicines in general (magnesium, L-theanine, ashwagandha in blends) prescription | No interaction study of a sleep blend was found. | None of the sources read tested blend-medicine interactions. | Absence of evidence Not enough evidence | Ask a doctor or pharmacist; show them the label. |
Who should check first 7
| Situation | Advice | Evidence |
|---|---|---|
| Pregnancy and breastfeeding | NCCIH says there is a lack of research on melatonin in pregnant or breastfeeding women, little is known about valerian, and kava may carry special risks because of harmful pyrone compounds. NCCIH says to consult a health care provider first. | Agency statement 26 28 25 27 |
| Children and teenagers | NCCIH says parents should speak to a health care provider before giving a child melatonin. Long-term effects, including on puberty and hormones, are unknown. Blends sold for children were not studied for safety in the sources read. | Agency statement and systematic review 26 12 |
| Older adults and dementia | NCCIH says melatonin may stay active longer in older adults and cause daytime drowsiness, and the 2015 American Academy of Sleep Medicine guidelines recommend against melatonin in people with dementia. | Agency statement 26 |
| Epilepsy or blood thinners | Medical supervision is needed with melatonin (NCCIH). Ask a doctor first. | Agency statement 26 |
| Liver disease or taking medicines that affect the liver | Kava and, rarely, valerian have been linked to liver injury. Ask a doctor before using any blend containing these herbs. No kidney-specific advice for magnesium blends was found in the sources read. | Agency statement and case report 25 28 10 |
| Ragweed or related plant allergy (chamomile) | NCCIH says people allergic to ragweed or related plants may react to chamomile. NCCIH also notes a possible risk of allergic reactions to melatonin supplements. | Agency statement 27 26 |
| Driving or other tasks needing alertness | Melatonin can cause daytime sleepiness and valerian mental dullness (agency and review statements). Ask a doctor or pharmacist if you drive. | Systematic review and agency statement 3 28 |
Overdose, product quality and regulators
Summary. No overdose threshold for sleep blends exists in the sources read. Children's accidental swallowing of melatonin is the main poisoning signal found (see Key safety).
Animal. Not reviewed.
High dose or long term signals. A 2022 review of melatonin at 10 mg or more in adults found more drowsiness, headache and dizziness, with limited side-effect reporting. NCCIH says long-term melatonin safety has not been established. The safety of long-term valerian use is unknown.
Overdose response. For a child who swallowed a sleep gummy, contact a poison centre or emergency services.
Genotoxicity. Not researched.
Label accuracy is the best-documented quality problem, and it has been tested for melatonin products rather than for finished multi-ingredient blends. Herbal extract quality also varies.
Melatonin content versus label. 2017: 31 products, melatonin from -83% to +478% of label, up to 465% between lots; 2025: 110 children's products, 0% to 667% of label; 2023 gummies: 22 of 25 inaccurately labeled (NCCIH summary). 8 18 26
Serotonin in melatonin products. Serotonin was found in eight of 31 supplements at 1 to 75 micrograms; NCCIH describes serotonin as a hormone that can have harmful effects even at relatively low levels. 8 26
Melatonin and CBD gummies. A 2023 JAMA research letter measured melatonin and CBD in gummies sold as melatonin gummies against label claims. Only the title and summary line were available, so no results are stated here. 7
Herbal extract quality. A 2020 valerian review suggests variable extract quality may explain inconsistent trial results. NCCIH says kava liver injury may relate to the plant variety, plant part used, or adulteration and contamination of products, and that words like standardized or certified do not guarantee quality. 22 25 27
Undeclared or added ingredients. No survey of undeclared ingredients in multi-ingredient sleep blends was read. One trial blend contained THC, so read labels for added cannabinoids. 11
| Body | Action | Date |
|---|---|---|
| NCCIH (US National Center for Complementary and Integrative Health) (United States) | Melatonin page: short-term use appears safe for most people but long-term safety is lacking; epilepsy and blood thinners need medical supervision; lack of research in pregnancy and breastfeeding; recommends speaking to a health care provider before giving children melatonin; notes melatonin is regulated as a dietary supplement. source | |
| NCCIH (US National Center for Complementary and Integrative Health) (United States) | Sleep disorders page: magnesium in supplements and medicines should not be consumed above the upper limit (110 mg for ages 4 to 8; 350 mg for adults and ages 9 to 18) unless recommended by a health care provider. Also states melatonin, valerian, kava, tryptophan and chamomile findings. source | |
| NCCIH (US National Center for Complementary and Integrative Health) (United States) | Valerian page: generally safe for short-term use by most adults; do not take with alcohol or sedatives; very rare liver injury; little known about pregnancy and breastfeeding. Kava page: rare, sometimes fatal liver injury; avoid with benzodiazepines or alcohol. source |
When to get medical help
- A child who may have swallowed melatonin or any sleep gummy: call your local poison centre or emergency services, especially if the child is very drowsy, hard to wake or having trouble breathing.
- Yellow skin or eyes, dark urine or severe stomach pain after using a sleep product, especially one with kava or valerian: get medical help (jaundice was the presenting sign in a reported case).
- Hives, swelling of the face, lips or tongue, or trouble breathing after a sleep product: call emergency services (allergic reactions to melatonin are a possible risk, per NCCIH).
- Fast or irregular heartbeat or fainting after very high magnesium intake: get medical help (NCCIH says extremely high intakes can affect heart rhythm).
- Sleep problems lasting a month or longer, loud snoring with gasping, or heavy daytime sleepiness: ask a doctor, because these can have causes a supplement will not fix (NCCIH describes sleep apnea warning signs).
Stop using the product and contact a clinician or emergency service. In the US, Poison Control is 1-800-222-1222.
General information only, not medical advice. Ask a clinician or pharmacist before use, especially with medicines, in pregnancy or with a health condition. See the Natural Remedy Safety guide.
Frequently asked questions
What is a sleep supplement blend?
A sleep blend is one product with several ingredients, such as melatonin, magnesium, L-theanine and herbs like valerian. It may be sold as capsules, gummies, powders or drinks.
Do sleep blends work?
Few finished blends have been tested. One small trial of a melatonin, magnesium and zinc mix in 43 older care-home residents and one trial of a hops, valerian and low-dose THC mix in 620 adults were positive. Other mixes gave modest or split results. Evidence for any given product is usually missing.
Is a blend better than melatonin alone?
No trial read compared a blend with its separate ingredients, so this is not known. Having several ingredients does not by itself mean more benefit.
Does melatonin help you fall asleep?
Does magnesium help sleep?
Does L-theanine help sleep?
A 2025 review of 19 trials found small self-rated gains in time to fall asleep and sleep quality. Many trials used mixes, so the gain may not be from L-theanine alone.
Does valerian work for sleep?
Can sleep gummies contain a different amount than the label says?
Are sleep blends safe for children?
Can sleep supplements harm the liver?
Who should ask a doctor first?
What do "proprietary blend" and "% Daily Value" mean on a label?
A proprietary blend usually lists one combined weight for several ingredients, so you cannot see how much of each is inside. % Daily Value shows how much of a nutrient, such as magnesium or zinc, a serving gives compared with a reference amount. This is a general explanation, not a legal reading.
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Editorial transparency
- Written by
- AlternativeMed editorial team. Research compiled with AI assistance, then checked against the sources listed.
- Medical review
- None. This page has not been reviewed by a physician or pharmacist.
- First published
- 2026-10-26
- Last substantive update
- 2026-10-26
- How we research
- We started from our existing sleep-blend summary, then re-read the PubMed abstracts of every review, trial, case report and lab study cited, and read the NCCIH melatonin, sleep disorders, valerian and kava pages on 2026-10-26. Only abstracts and agency pages were read. The NIH ODS magnesium page was blocked and is marked unverified.
- How we rate evidence
- See "How we rate evidence" in the Evidence tab.
- Independence
- No product is promoted on this page. No affiliate links are shown. Funding is not stated in several trial abstracts; this is noted where it applies.
Sources 30
Each source was opened and checked. Where we read only the abstract, it says so. The small numbers in the text point here.
- Arab A, Rafie N, Amani R, Shirani F. The Role of Magnesium in Sleep Health: a Systematic Review of Available Literature.. Biol Trace Elem Res. 2023. PMID 35184264. DOI 10.1007/s12011-022-03162-1. (abstract)
- Bent S, Padula A, Moore D, Patterson M, Mehling W. Valerian for sleep: a systematic review and meta-analysis.. Am J Med. 2006. PMID 17145239. DOI 10.1016/j.amjmed.2006.02.026. (abstract)
- Besag FMC, Vasey MJ, Lao KSJ, Wong ICK. Adverse Events Associated with Melatonin for the Treatment of Primary or Secondary Sleep Disorders: A Systematic Review.. CNS Drugs. 2019. PMID 31722088. DOI 10.1007/s40263-019-00680-w. (abstract)
- Bulman A, D'Cunha NM, Marx W, Turner M, McKune A, Naumovski N. The effects of L-theanine consumption on sleep outcomes: A systematic review and meta-analysis.. Sleep Med Rev. 2025. PMID 40056718. DOI 10.1016/j.smrv.2025.102076. (abstract)
- Cheah KL, Norhayati MN, Husniati Yaacob L, Abdul Rahman R. Effect of Ashwagandha (Withania somnifera) extract on sleep: A systematic review and meta-analysis.. PLoS One. 2021. PMID 34559859. DOI 10.1371/journal.pone.0257843. (abstract)
- Choi K, Lee YJ, Park S, Je NK, Suh HS. Efficacy of melatonin for chronic insomnia: Systematic reviews and meta-analyses.. Sleep Med Rev. 2022. PMID 36179487. DOI 10.1016/j.smrv.2022.101692. (abstract)
- Cohen PA, Avula B, Wang YH, Katragunta K, Khan I. Quantity of Melatonin and CBD in Melatonin Gummies Sold in the US.. JAMA. 2023. PMID 37097362. DOI 10.1001/jama.2023.2296. (title-only)
- Erland LA, Saxena PK. Melatonin Natural Health Products and Supplements: Presence of Serotonin and Significant Variability of Melatonin Content.. J Clin Sleep Med. 2017. PMID 27855744. DOI 10.5664/jcsm.6462. (abstract)
- Gong J, Jia X, Wang L, Lu Y, Guo R, Gong R et al.. Walnut peptide and theanine combination ameliorates sleep disorders: a multi-species study including a human trial.. Food Funct. 2026. PMID 41531275. DOI 10.1039/d5fo03867g. (abstract)
- Koenig G, Callipari C, Smereck JA. Acute Liver Injury After Long-Term Herbal "Liver Cleansing" and "Sleep Aid" Supplement Use.. J Emerg Med. 2021. PMID 33579656. DOI 10.1016/j.jemermed.2021.01.004. (abstract)
- Kolobaric A, Hewlings SJ, Bryant C, Colwell CS, R D'Adamo C, Rosner B et al.. A Randomized, Double-Blind, Placebo-Controlled Decentralized Trial to Assess Sleep, Health Outcomes, and Overall Well-Being in Healthy Adults Reporting Disturbed Sleep, Taking a Melatonin-Free Supplement.. Nutrients. 2023. PMID 37686820. DOI 10.3390/nu15173788. (abstract)
- Kracht CL, Bolamperti G, Breeden R, Crocker M, Christifano DN, Gibler RC et al.. Melatonin Use in Young Children: A Systematic Review.. JAMA Netw Open. 2026. PMID 41481289. DOI 10.1001/jamanetworkopen.2025.51958. (abstract)
- Lelak K, Vohra V, Neuman MI, Toce MS, Sethuraman U. Pediatric Melatonin Ingestions - United States, 2012-2021.. MMWR Morb Mortal Wkly Rep. 2022. PMID 35653284. DOI 10.15585/mmwr.mm7122a1. (abstract)
- Mah J, Pitre T. Oral magnesium supplementation for insomnia in older adults: a Systematic Review & Meta-Analysis.. BMC Complement Med Ther. 2021. PMID 33865376. DOI 10.1186/s12906-021-03297-z. (abstract)
- Maruani J, Reynaud E, Chambe J, Palagini L, Bourgin P, Geoffroy PA. Efficacy of melatonin and ramelteon for the acute and long-term management of insomnia disorder in adults: A systematic review and meta-analysis.. J Sleep Res. 2023. PMID 37434463. DOI 10.1111/jsr.13939. (abstract)
- Menczel Schrire Z, Phillips CL, Chapman JL, Duffy SL, Wong G, D'Rozario AL et al.. Safety of higher doses of melatonin in adults: A systematic review and meta-analysis.. J Pineal Res. 2022. PMID 34923676. DOI 10.1111/jpi.12782. (abstract)
- Morin CM, Koetter U, Bastien C, Ware JC, Wooten V. Valerian-hops combination and diphenhydramine for treating insomnia: a randomized placebo-controlled clinical trial.. Sleep. 2005. PMID 16335333. DOI 10.1093/sleep/28.11.1465. (abstract)
- Pawar RS, Coppin JP, Khanna S, Parker CH. A Survey of Melatonin in Dietary Supplement Products Sold in the United States.. Drug Test Anal. 2025. PMID 39482109. DOI 10.1002/dta.3823. (abstract)
- Rawji A, Peltier MR, Mourtzanakis K, Awan S, Rana J, Pothen NJ et al.. Examining the Effects of Supplemental Magnesium on Self-Reported Anxiety and Sleep Quality: A Systematic Review.. Cureus. 2024. PMID 38817505. DOI 10.7759/cureus.59317. (abstract)
- Rondanelli M, Opizzi A, Monteferrario F, Antoniello N, Manni R, Klersy C. The effect of melatonin, magnesium, and zinc on primary insomnia in long-term care facility residents in Italy: a double-blind, placebo-controlled clinical trial.. J Am Geriatr Soc. 2011. PMID 21226679. DOI 10.1111/j.1532-5415.2010.03232.x. (abstract)
- Schicktanz N, Gerhards C, Schlitt T, Aerni A, Müggler E, de Quervain D et al.. Effects of a Valerian-Hops Extract Combination (Ze 91019) on Sleep Duration and Daytime Cognitive and Psychological Parameters in Occasional Insomnia: A Randomized Controlled Feasibility Trial.. Brain Behav. 2025. PMID 40462685. DOI 10.1002/brb3.70600. (abstract)
- Shinjyo N, Waddell G, Green J. Valerian Root in Treating Sleep Problems and Associated Disorders-A Systematic Review and Meta-Analysis.. J Evid Based Integr Med. 2020. PMID 33086877. DOI 10.1177/2515690X20967323. (abstract)
- Teschke R. Kava hepatotoxicity--a clinical review.. Ann Hepatol. 2010. PMID 20720265. (abstract)
- . General explanation of supplement label wording (editorial). . . (summary-only)
- . NCCIH: Kava (page read 2026-10-26). . . (page)
- . NCCIH: Melatonin - What You Need To Know (page read 2026-10-26). . . (page)
- . NCCIH: Sleep Disorders and Complementary Health Approaches (page read 2026-10-26). . . (page)
- . NCCIH: Valerian (page read 2026-10-26). . . (page)
- . NIH Office of Dietary Supplements: Magnesium fact sheet (could not be read). . . (not-read)
- . Existing AlternativeMed sleep blends summary (read 2026-10-26). . . (summary-only)
Where to buy
Check the label first. Whatever you buy, look for these:
- The amount of the active ingredient per serving, not just the front-label claim
- A third-party testing mark (USP, NSF or ConsumerLab)
- Other ingredients and allergens
- Ask a pharmacist about interactions with your medicines
Talk to a pharmacist or doctor before you start any supplement, especially if you take medicines. See the Safety tab for interactions.
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