How Much Collagen Do Studies and Labels Use? Amounts, Servings and Types
The amounts of collagen peptides, gelatin-type products and undenatured type II collagen used in published trials, with product type, duration and outcome. Study amounts only, not advice.
Content last updated . This page has not been medically reviewed.
Quick answer
There is no official daily amount for collagen supplements in the sources we read, and the amounts in trials vary widely. Hydrolyzed collagen studies have used anywhere from a few hundred milligrams to 15 grams a day, [1] [2] and undenatured type II collagen (UC-II) has been studied at 40 milligrams, because it is a different kind of product. Everything below is what a study gave to its volunteers. It is not a recommendation, a safe limit or a target. What is right for a person is a decision for a clinician or pharmacist.
How to read the table: "product type" matters because hydrolyzed collagen peptides, gelatin and UC-II are different interventions and results do not transfer between them. "Outcome" says what was measured; an instrument reading is not the same as how someone feels or whether they have fewer fractures.
Amounts used in published studies
| Study | Product type | Amount as reported | Duration | People and outcome |
|---|---|---|---|---|
| Proksch 2014 | Collagen hydrolysate | 2.5 g or 5.0 g once daily vs placebo | 8 weeks | 69 women aged 35 to 55; skin elasticity was higher than placebo in both groups; no side effects noted. [3] |
| Bolke 2019 | A drink with 2.5 g collagen peptides blended with vitamin C, zinc, biotin, vitamin E complex and fruit extract | Blend containing 2.5 g collagen peptides | 12 weeks | 72 women aged 35 and over; skin hydration, elasticity, roughness and density improved. The effect cannot be assigned to collagen alone. [4] |
| König 2018 | Specific collagen peptides | 5 g daily vs placebo | 12 months | 131 postmenopausal women with age-related low bone density; spine and femoral neck density increased slightly compared with placebo (a scan measure, not fractures). [5] |
| Zdzieblik 2015 | Collagen peptides | 15 g daily vs silica placebo | 12 weeks, with resistance training | 53 men with sarcopenia, average age about 72; fat-free mass and leg strength rose more than placebo. [2] |
| Clark 2008 | Collagen hydrolysate liquid | 10 g in 25 mL | 24 weeks | 147 athletes randomized, 97 analyzed; some joint pain scores improved more than placebo. [6] |
| Praet 2019 | Specific collagen peptides with calf exercises | Amount not stated in the abstract | 3 months each in a crossover | 20 people with Achilles tendon problems; symptom score improved more with collagen early on. [7] |
| Lugo 2016 | Undenatured type II collagen (UC-II) | 40 mg daily (milligrams, not grams) | 180 days | 191 people with knee osteoarthritis; overall WOMAC score improved vs placebo and vs glucosamine plus chondroitin. [8] |
What the reviews say about the range
A 2023 review and meta-analysis of 26 randomized trials in skin tabulated the intervention amounts, which ranged from 372 mg to 12 g per day (for example 1 g and 5 g in one trial, 10 g in others). [1] It found improved skin hydration and elasticity compared with placebo, and it identified biases in the included trials and called for larger studies. [1] A 2021 meta-analysis of 19 skin trials concluded that ingesting hydrolyzed collagen for 90 days is effective for skin aging. [9] A 2019 protein-quality calculation described the effective amounts observed in the literature as 2.5 to 15 g per day. [10] One of its authors discloses research services for a maker of collagen supplements; the author says this did not influence the work. [10]Several skin trials tested two amounts of the same product, for example 2.5 g and 5.0 g, and both improved elasticity versus placebo in one of them. [3] For joint, bone or muscle outcomes, Proper evidence not found in our searches for a trial that compared amounts head to head (a PubMed dose-response search returned nothing relevant). So "more grams works better" is not shown by the sources we read.
How labels differ from studies
FDA labeling guidance for US supplements defines one serving as the maximum amount recommended on the label per eating occasion, or one unit when there is no recommendation. [11] So a label that says "1 to 3 scoops" lists nutrition for 3 scoops as the serving. Always check the serving size against the grams per scoop before comparing a product with a study. The step-by-step arithmetic is on Reading a collagen supplement label; a longer reference list is on Collagen amounts in studies.Frequently asked questions
How many grams of collagen do studies use?
In the studies above, from 2.5 g to 15 g a day for hydrolyzed collagen, and 40 mg of UC-II. [3] [2] [8] These are study amounts, not advice.
Is there an official recommended amount of collagen?
Not described in the sources we read. A clinician or pharmacist can advise a person.
Do higher amounts work better?
Proper evidence not found. One skin trial found both 2.5 g and 5.0 g improved elasticity versus placebo. [3]
Why does UC-II use milligrams when collagen peptides use grams?
They are different products with different proposed ways of working; UC-II trials used 40 mg. [8]
Can I compare my product's label with these studies?
Only roughly, and only for the same product type, after checking serving size. FDA defines serving size as the maximum recommended amount per eating occasion. [11]
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
How to read the evidence labels
Labels used on this page: "promising but limited", "mixed", "insufficient evidence".
Limits and uncertainty
- Many trials are short (weeks to months), small, and measure surrogate outcomes such as skin instruments, blood markers or scans.
- Some studies are funded or run by companies; the abstracts we read often do not state funding, so we cannot say.
- Amounts differ by product type, so the same number of grams can mean different things in different products. See Collagen peptides, hydrolyzed collagen and collagen hydrolysate and UC-II and hydrolyzed collagen.
- Study volunteers were mostly adults with a specific health situation. Children, pregnancy and breastfeeding are covered on Collagen in pregnancy, breastfeeding and children: proper evidence not found.
Safety and who should ask first
We found no official upper intake level for collagen in the sources we read, which is not the same as proof that any amount is safe. People with kidney disease, a history of kidney stones (see Collagen, hydroxyproline, oxalate and kidney stones), allergies to fish, egg or beef, or who take medicines should ask first; see Collagen and medicines and Medication interactions. If a product causes swelling of the lips or throat or trouble swallowing, MedlinePlus lists these as serious allergic reaction signs and says to call 911. [12] Never stop a prescribed medicine because of a supplement.
References
- Pu SY, Huang YL, Pu CM, et al. Effects of oral collagen for skin anti-aging: a systematic review and meta-analysis. Nutrients 2023;15(9):2080. Read 2026-10-23 (open-access full text, intervention table).
- Zdzieblik D, Oesser S, Baumstark MW, Gollhofer A, König D. Collagen peptide supplementation in combination with resistance training improves body composition and increases muscle strength in elderly sarcopenic men: a randomised controlled trial. Br J Nutr 2015. Read 2026-10-23 (abstract).
- Proksch E, Segger D, Degwert J, et al. Oral supplementation of specific collagen peptides has beneficial effects on human skin physiology: a double-blind, placebo-controlled study. Skin Pharmacol Physiol 2014. Read 2026-10-23 (abstract).
- Bolke L, Schlippe G, Gerß J, Voss W. A collagen supplement improves skin hydration, elasticity, roughness, and density: results of a randomized, placebo-controlled, blind study. Nutrients 2019. Read 2026-10-23 (abstract).
- König D, Oesser S, Scharla S, Zdzieblik D, Gollhofer A. Specific collagen peptides improve bone mineral density and bone markers in postmenopausal women: a randomized controlled study. Nutrients 2018. Read 2026-10-23 (abstract).
- Clark KL, Sebastianelli W, Flechsenhar KR, et al. 24-week study on the use of collagen hydrolysate as a dietary supplement in athletes with activity-related joint pain. Curr Med Res Opin 2008. Read 2026-10-23 (abstract).
- Praet SFE, Purdam CR, Welvaert M, et al. Oral supplementation of specific collagen peptides combined with calf-strengthening exercises enhances function and reduces pain in Achilles tendinopathy patients. Nutrients 2019. Read 2026-10-23 (abstract).
- Lugo JP, Saiyed ZM, Lane NE. Efficacy and tolerability of an undenatured type II collagen supplement in modulating knee osteoarthritis symptoms: a multicenter randomized, double-blind, placebo-controlled study. Nutr J 2016. Read 2026-10-23 (abstract).
- de Miranda RB, Weimer P, Rossi RC. Effects of hydrolyzed collagen supplementation on skin aging: a systematic review and meta-analysis. Int J Dermatol 2021. Read 2026-10-23 (abstract).
- Paul C, Leser S, Oesser S. Significant amounts of functional collagen peptides can be incorporated in the diet while maintaining indispensable amino acid balance. Nutrients 2019;11(5):1079. Read 2026-10-23 (abstract and conflict statement).
- FDA. Dietary Supplement Labeling Guide: Chapter IV, Nutrition Labeling. US Food and Drug Administration (nonbinding guidance, April 2005). Read 2026-10-23.
- MedlinePlus. Anaphylaxis. US National Library of Medicine. Read 2026-10-23.
Education, not medical advice. This page is for general information. It does not diagnose or treat any condition and is not a substitute for care from a qualified health professional. Natural does not automatically mean safe. Ask a clinician or pharmacist before changing your care, especially if you take medication, are pregnant or breastfeeding, or have a health condition.