Botanical and Mushroom Nootropics: Bacopa, Ginkgo, Rhodiola and Lion's Mane (Where to Find Each Guide)
A signpost to the guides for bacopa, ginkgo, rhodiola, ashwagandha and lion's mane, with what reviews found for memory and attention and how strong that evidence is.
Content last updated . This page has not been medically reviewed.
What is Botanical and mushroom nootropics good for?
What the body uses it for, and how strong the evidence is. A normal job in the body is not proof that extra supplements add benefit; each card says which.
Bacopa: memory recall and attention tests
Preliminary or mixedIn reviews of 12-week trials in adults without dementia, bacopa extract was linked to better free recall on some memory tests and faster attention and reaction times.
Supplements: Small, short trials; a faster score on a lab task is not proven better everyday memory, and gains on other abilities were little. Authors said a large trial was needed.
Ginkgo: dementia prevention (no effect found)
Not enough evidenceIn the large GEM trial of adults aged 75 or older, ginkgo extract did not reduce dementia or Alzheimer disease.
Supplements: No good evidence of benefit for preventing dementia; this result is for people 75 or older and does not speak to memory in younger adults.
Ginkgo: mild cognitive impairment and dementia symptoms
Preliminary or mixedA 2026 Cochrane review found ginkgo probably has little or no effect in mild cognitive impairment and low-certainty small to moderate benefit for dementia symptoms at six months.
Supplements: Mixed: probably no effect in mild cognitive impairment; low-certainty benefit in dementia. Not a substitute for clinical assessment.
Lion's mane: cognition in small trials
Preliminary or mixedOne 16-week trial in 30 adults aged 50 to 80 with mild cognitive impairment reported higher scores than placebo that fell after stopping; trials in healthy young adults showed no clear overall gain.
Supplements: Promising but limited; results do not transfer from older adults with memory change to healthy people.
Lion's mane: laboratory findings on nerve cells
Lab or animal research onlyLaboratory studies of Hericium erinaceus are described in a systematic review alongside the small human trials.
Supplements: Laboratory and animal work only; no proof of benefit in people from these findings.
Healthy adults: overall picture for marketed brain ingredients
Not enough evidenceA systematic review of nine ingredients marketed for thinking in healthy adults, including bacopa and ginkgo, called the science low certainty, with inconsistent and imprecise studies.
Supplements: Insufficient evidence for a reliable gain in healthy adults.
Bacopa compared with ginkgo
Preliminary or mixedA 2026 network meta-analysis of 29 trials (2,107 healthy adults) reported better working memory with bacopa than ginkgo or placebo, and no significant differences in attention or processing speed.
Supplements: Indirect and limited; does not show either is best.
Connected topics
Open a group to see how each topic connects and how strong the evidence is.
Health goals (2)
- Cognitive PerformancePreliminary or mixed
Bacopa meta-analysis reported faster reaction and Trail B times; a low-certainty review of marketed ingredients for healthy adults found inconsistent studies.
- Memory SupportPreliminary or mixed
Reviews of 12-week bacopa trials report better recall on some memory tests in adults without dementia; ginkgo and lion's mane results are null or limited. Evidence is small and does not transfer between groups.
Body systems (2)
- Brain & FocusPreliminary or mixed
These herbs are studied for memory and attention with small or null results, so the link is one of study focus rather than proven benefit.
- Nervous SystemPreliminary or mixed
Studied for cognitive outcomes; evidence is limited and mixed.
Body parts (2)
- BrainPreliminary or mixed
Studied for thinking and memory; results are limited, mixed or null depending on herb and group.
- Nervous SystemPreliminary or mixed
Studied for cognitive outcomes; evidence is limited and mixed.
Functional actions (1)
- Cognitive EnhancementPreliminary or mixed
The marketing claim; only bacopa shows some small test-score gains in adults without dementia, and ginkgo prevention trials were negative.
Conditions & symptoms (5)
- DementiaPreliminary or mixed
Ginkgo did not reduce dementia in a large trial of adults 75 or older; a Cochrane review found low-certainty small to moderate symptom benefit. Memory change needs a clinician, not a supplement trial.
- Mild Cognitive DisorderPreliminary or mixed
Ginkgo probably has little or no effect (Cochrane 2026); one small lion's mane trial in 30 people reported higher scores while on it, falling after stopping.
- Prolonged Bleeding TimeDocumented risk
NCCIH says ginkgo may raise bleeding risk with anticoagulants such as warfarin; a lab-measure meta-analysis found no higher risk, so evidence is mixed. Tell your surgical team.
- Drug-Induced Liver DiseaseDocumented risk
Rare liver injury has been linked to ashwagandha (named on the group page); bacopa, ginkgo and lion's mane were not linked to clinically apparent injury in LiverTox.
- Gastrointestinal SymptomDocumented risk
Bacopa commonly causes digestive effects such as nausea, cramps and more frequent stools; ginkgo can cause stomach upset.
Documented risks and interactions (3)
- Ginkgo and bleeding with blood thinners. NCCIH says ginkgo may increase bleeding risk in people taking anticoagulants such as warfarin; a 2011 meta-analysis of laboratory clotting measures did not find higher risk.
- Bacopa: digestive side effects. StatPearls lists increased stool frequency, nausea and abdominal cramps as the most common bacopa side effects.
- Herbal safety: liver, pregnancy and product quality. Ashwagandha has rare reported liver injury cases; ginkgo may be unsafe in pregnancy; bacopa, ginkgo and lion's mane were not linked to clinically apparent liver injury in LiverTox. Product contents vary.
At a glance
| Ingredient | What the research found | Label | Where to read more |
|---|---|---|---|
| Bacopa (Bacopa monnieri) | A meta-analysis of nine trials (518 people) reported shorter times on an attention test. [1] A review of six 12-week trials in adults without dementia found better free recall on 9 of 17 memory tests and little evidence for other abilities. [2] | Promising but limited | More about Bacopa (Bacopa monnieri) → |
| Ginkgo (Ginkgo biloba) | The GEM trial followed 3,069 adults aged 75 or older for a median 6.1 years; ginkgo extract did not reduce dementia. [3] A 2026 Cochrane review found probably little or no effect in mild cognitive impairment. [4] | No good evidence of benefit for prevention; mixed in dementia | More about Ginkgo (Ginkgo biloba) → |
| Rhodiola (Rhodiola rosea) | A review of 24 trials covered ashwagandha (19) and rhodiola (5); it named short trials, small samples and varied methods as limits. [5] | Insufficient evidence for memory | More about Rhodiola (Rhodiola rosea) → |
| Ashwagandha (Withania somnifera) | A 2026 meta-analysis of 20 studies (1,249 people) reported better memory, attention and processing speed. [6] NCCIH says there is not enough evidence on cognitive function. [7] | Promising but limited; sources disagree | More about Ashwagandha (Withania somnifera) → |
| Lion's mane (Hericium erinaceus) | A systematic review found five randomized trials and three pilot trials, plus laboratory studies. [8] | Insufficient evidence | More about Lion's mane (Hericium erinaceus) → |
Things to keep in mind
- Different groups, different answers. The bacopa review above studied adults without dementia; the ginkgo trial studied people aged 75 or older. Results do not transfer between groups. [2][3]
- The forms differ. Trials use specific extracts. A capsule, a powder and a tea are not the same product, and findings should not be assumed to carry across.
- Short tests are not daily life. A faster score on a lab task does not prove better memory or work performance.
- The overall picture is cautious. A systematic review of nine ingredients marketed for thinking in healthy adults, including bacopa, ginkgo, ginseng and rhodiola, described the science as low certainty, with inconsistent and imprecise studies. [9]
Related guides on this site
- Ashwagandha in Ayurveda: Ashwagandha in Ayurveda.
- Bacopa in Ayurvedic tradition: Bacopa (Brahmi) in Ayurveda.
- Choline: Choline.
- A wider comparison: Nootropics and memory supplements compared.
- Other herbs studied for memory: sage, saffron, gotu kola, ginseng and more.
Frequently asked questions
Does ginkgo improve memory?
In a large trial of adults aged 75 or older it did not reduce dementia, and a 2026 Cochrane review found probably little or no effect in mild cognitive impairment. [3][4]
Does bacopa work for memory?
Reviews of 12-week trials report some benefit on certain memory and attention tests, but the evidence is limited and mostly from adults without dementia. [2][1]
Is lion's mane proven?
No. The review found a small number of human trials alongside many laboratory studies. [8]
Is ashwagandha a nootropic?
It is mainly studied as an adaptogen. A 2026 meta-analysis reported cognitive gains, while NCCIH says there is not enough evidence on cognitive function. [6][7]
Are herbal brain supplements safe because they are natural?
Not automatically. Herbs can cause side effects and interact with medicines, so ask a clinician or pharmacist first. [10]
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, no good evidence of benefit. A label describes how reliable the research is, not whether a product is safe or right for you.
Safety
References
- Kongkeaw C et al. Meta-analysis of randomized controlled trials on cognitive effects of Bacopa monnieri extract. J Ethnopharmacol 2014. Read 2026-10-22.
- Pase MP et al. The cognitive-enhancing effects of Bacopa monnieri: a systematic review of randomized, controlled human clinical trials. J Altern Complement Med 2012. Read 2026-10-22.
- DeKosky ST et al. Ginkgo biloba for prevention of dementia: a randomized controlled trial (GEM). JAMA 2008. Read 2026-10-22.
- Wieland LS et al. Ginkgo biloba for cognitive impairment and dementia. Cochrane Database Syst Rev 2026. Read 2026-10-22.
- Łuszczak J, Kocki J. Clinical evidence for the adaptogenic effects of Withania somnifera and Rhodiola rosea: a systematic review. Ann Agric Environ Med 2026. Read 2026-10-22.
- Zhu X et al. Effects of Withania somnifera (Ashwagandha) on cognitive and physical function in adults: a systematic review and meta-analysis. Front Pharmacol 2026. Read 2026-10-22.
- National Center for Complementary and Integrative Health (US). Ashwagandha. Read 2026-10-22.
- Menon A et al. Benefits, side effects, and uses of Hericium erinaceus as a supplement: a systematic review. Front Nutr 2025. Read 2026-10-22.
- Crawford C et al. Dietary Supplement Ingredients for Optimizing Cognitive Performance Among Healthy Adults: A Systematic Review. J Altern Complement Med 2021. Read 2026-10-22.
- National Center for Complementary and Integrative Health (US). Ginkgo. Read 2026-10-22.