Bacopa for Memory: Slow, Modest Gains in Older Trials, and a Recent Null Result
Bacopa monnieri is a popular Ayurvedic herb sold for memory. Older trials found small gains after about 12 weeks, mostly in attention speed and word recall, but a 2025 trial in midlife adults found no cognitive benefit. Here is what each trial found, who paid for it, and who should be careful.
By Kymata Health Editorial Published Last checked
We earn a commission if you buy through links on this page. It never changes our grades or rankings. How we make money →
Quick pick
From a partner brand · paid linkBacopa Monnieri
from Supersmart
Label: 6 capsules: 1,500 mg leaf extract standardised to 20% bacosides (250 mg per capsule), well above the 300 mg/day used in the trials in our evidence profile.
Best for regular use: $17.85 on subscription vs $21 one-time (checked Oct 11, 2026).
5% off with the Supersmart newsletter. Terms from Supersmart’s site, checked Oct 16, 2026. Supersmart’s footer offer reads “Subscribe to our newsletter and obtain a 5% permanent discount.”
Key takeaways
From 7 sources- A 2014 meta-analysis of 9 trials in 518 people found faster attention and reaction times after at least 12 weeks of standardized bacopa extract1.
- In two trials of older adults taking 300 mg a day for 12 weeks, delayed word recall improved more than with placebo23.
- A 2025 trial of 101 adults aged 40 to 70 with self-reported memory problems found no difference from placebo in verbal learning, attention or working memory4.
- Stomach upset is the most common complaint: one trial reported more stool frequency, cramps and nausea on bacopa, and another more digestive complaints and headaches34.
- In lab tests, bacopa extract blocked several drug-processing liver enzymes, so people on regular medicines should check with a pharmacist first; people taking thyroid hormone medicines are advised not to take it56.
What this article covers
1 evidence profileThe evidence, graded
Pulled from the trial tables in our evidence profiles. Grades follow our evidence-grading policy.
Graded findings
3 rows- CGrade CAttention speed and reaction timeImproved Cognition improved versus placebo, particularly speed of attention and choice reaction time.Bacopa monnieri · Meta-analysis · n=518 · 2014 · PMID 24252493
- CGrade CDelayed word recall and attention in older adultsImproved Delayed word recall and Stroop scores improved versus placebo; depression and anxiety scores fell.Bacopa monnieri · RCT · n=54 · 2008 · PMID 18611150
- ∅No effectVerbal learning and memory in midlifeNo effect No between-group differences in the primary cognitive outcomes.Bacopa monnieri · RCT · n=101 · 2025 · PMID 41091332
What the pooled trials show
Bacopa monnieri is an Ayurvedic herb, sold as standardized extracts for memory and focus. A 2014 meta-analysis pooled 9 randomized, placebo-controlled trials (518 people) that gave standardized extracts for at least 12 weeks without other medicines1.
Across 437 people with usable data, bacopa shortened time on the Trail B test by 17.9 ms and cut choice reaction time by 10.6 ms versus placebo1. The authors read this as a possible gain in speed of attention, and said only a large head-to-head trial against an existing medicine would give definitive data1.
The PubMed record for this meta-analysis does not state a funding source.
Trials in older adults
In a Portland, Oregon trial, 54 adults aged 65 or older without signs of dementia were randomized to 300 mg a day of standardized bacopa extract or placebo for 12 weeks, after a 6-week placebo run-in; 48 finished2. Delayed word recall improved on bacopa by more than one word on average while the placebo group stayed flat, and Stroop reaction times also improved2. There was no effect on divided attention, working memory, mood or blood pressure2.
That trial was supported by the NIH National Center for Complementary and Alternative Medicine and the Northwest Health Foundation; MediHerb supplied the tablets free, and one author chaired MediHerb but was not involved in running or analysing the study2.
In an Australian trial, 98 healthy adults over 55 started 300 mg a day of a bacopa extract (BacoMind, made by Natural Remedies) or placebo, and 81 finished 12 weeks3. Bacopa improved verbal learning, memory acquisition and delayed recall on a word-list test, while figure memory, self-rated memory and a trail-making test did not differ from placebo3. Its PubMed record does not state who funded it3.
The 2025 trial that found no memory benefit
A 2025 Australian trial randomized 101 adults aged 40 to 70 who reported memory and attention problems to 300 mg a day of a bacopa extract (Bacumen) or placebo for 12 weeks; 87 completed4.
There were no between-group differences in its main outcomes: verbal learning (p = 0.391), attention (p = 0.713) and working memory (p = 0.610)4. Self-reported stress reactivity fell more on bacopa (p = 0.03), a secondary finding the authors said needs testing in future trials4.
The study was funded by US Pharma Lab, which also supplied the bacopa and placebo capsules; the published statement says the funder was not involved in data collection or interpretation4. The lead author directs Clinical Research Australia, a contract research organization that has received funding from nutraceutical companies4.
Taken together, the older trials point to small, slow gains in attention speed and word recall, while the newest and largest of the single trials described here found none. The bacopa page grades each finding.
How it compares with other memory supplements
Every bacopa trial described here ran for at least 12 weeks before testing memory, so short trials of a few weeks say little about the herb124. For other options people try for memory and focus, see our explainers on lion's mane, ginkgo biloba and magnesium L-threonate.
Who should be careful
Check with a doctor or pharmacist before adding bacopa if any of these apply:
- Regular prescription medicines: in lab tests, bacopa extract inhibited the liver enzymes CYP2C19, CYP2C9, CYP1A2 and CYP3A4, and the authors warned it could contribute to interactions with drugs those enzymes process; this has not been confirmed in people5.
- Thyroid conditions or thyroid medicine: the Merck Manual advises that people taking thyroid hormone medicines should not take bacopa because it may raise thyroid hormone levels6. The signal comes from a mouse study in which a high dose (200 mg/kg) raised T4 by 41%7.
- A sensitive stomach: one older-adult trial reported more stool frequency, abdominal cramps and nausea on bacopa than placebo3, and the 2025 trial reported more adverse reactions on bacopa (p = 0.024), mainly digestive complaints and headaches4.
- New or worsening memory problems: these deserve a medical check rather than a supplement trial; the Portland trial excluded people with signs of dementia2.
- Pregnancy or breastfeeding: the trials described here enrolled adults aged 40 and older234, so they say nothing about safety in pregnancy or breastfeeding.
Quick answers
Common questions
4 answersHow long does bacopa take to work?
How much bacopa was used in the trials?
Does bacopa help young, healthy people focus?
Keep reading
Full evidence profiles
Every graded study, studied doses, interactions and safetyRelated articles
4 articles- ArticleAlpha-GPC vs Choline Bitartrate: Blood Choline Rose the Same, but One Detail DifferedIs alpha-GPC better than choline bitartrate?
- ArticleApigenin for Sleep: No Trial Has Tested It on Its Own, and the Closest Evidence Is MixedDoes apigenin help you sleep?
- ArticleAshwagandha for Stress and Sleep: What the Trials Found, and Why the Results Vary So MuchDoes ashwagandha help with stress and sleep?
- ArticleAshwagandha for Testosterone: What the Trials Show (About 57 ng/dL, With Big Caveats)Does ashwagandha raise testosterone, and by how much?
Stacks that use it
Tools
More on Supplements and vitamins
8 pages- TopicSupplements and vitamins: every page
- PreviousB12 Shots vs B12 Pills: When Injections Matter, and When High-Dose Oral Works Just as WellFor most people with low B12, a high-dose daily tablet raised blood levels as well as injections in the Cochrane trials, and cost less.
- NextBeetroot vs Citrulline: Two Nitric Oxide Routes, Both With Small PayoffsBeetroot nitrate has the bigger body of evidence, mostly for endurance-type tasks in recreational exercisers.
- In this topicBerberine Side Effects and Drug Interactions: The Liver-Enzyme Problem Nobody MentionsBerberine’s stomach side effects are well known.
- In this topicBerberine vs Inositol for PCOS: More Trials on One Side, Integrity Questions on the OtherInositol has the larger PCOS trial base, though the review behind the 2023 international guideline still called it inconclusive.
- In this topicBerberine, “Nature’s Ozempic”: What the Trials Actually Show (Hint: About 2 Pounds)Social media crowned berberine the budget GLP-1.
- ToolEvidence-graded supplement stacks
- TopicsBrowse all topics
Browse the full Supplement & Nutrient Encyclopedia or all supplement articles.
Where to buy Bacopa monnieri
Products from brands we partner with that contain Bacopa monnieri. Check the amount per serving against the doses studied, and the label for other ingredients.
Bacopa monnieri products from partner brands
1 product Paid links · we earn a commission- Quick pickSupersmartBacopa Monnieri5% off with the Supersmart newsletterGet 5% off with the newsletter (paid link, opens in new tab)
Offer details
Sign up for the newsletter at the bottom of us.supersmart.com; Supersmart says the 5% discount is permanent.
- Supersmart’s footer offer reads “Subscribe to our newsletter and obtain a 5% permanent discount.”
- Supersmart says Subscribe & Save discounts can’t be combined with the 5% newsletter discount.
- 20% applies when 3 or more products ship on auto-delivery to the same address.
- Only products that show the Subscribe & Save offer qualify, and a Supersmart account is required.
- The newsletter discount and Subscribe & Save are separate offers; we don’t claim they combine.
- Offer terms from Supersmart’s site, checked Oct 16, 2026. Offers can change; the brand's checkout is final.
6 capsules: 1,500 mg leaf extract standardised to 20% bacosides (250 mg per capsule), well above the 300 mg/day used in the trials above; 16 servings
$21.00one-time$17.85subscribeChecked Oct 11, 2026
References
7 sources. Numbers in the text link here.
Sources cited in this article
7 sources- 1Meta-analysis of randomized controlled trials on cognitive effects of Bacopa monnieri extractJ Ethnopharmacol, 2014 · PMID 24252493
- 2Effects of a standardized Bacopa monnieri extract on cognitive performance, anxiety, and depression in the elderly: a randomized, double-blind, placebo-controlled trialJ Altern Complement Med, 2008 · PMID 18611150
- 3Does Bacopa monnieri improve memory performance in older persons? Results of a randomized, placebo-controlled, double-blind trialJ Altern Complement Med, 2010 · PMID 20590480
- 4The Effects of a Bacopa monnieri Extract (Bacumen) on Cognition, Stress, and Fatigue in Healthy Adults: A Randomized, Double-Blind, Placebo-Controlled TrialClin Drug Investig, 2025 · PMID 41091332
- 5Inhibition of human cytochrome P450 enzymes by Bacopa monnieri standardized extract and constituentsMolecules, 2014 · PMID 24566323
- 6Bacopa (Merck Manual Professional Version, dietary supplements)Merck Manual, 2025
- 7Relative efficacy of three medicinal plant extracts in the alteration of thyroid hormone concentrations in male miceJ Ethnopharmacol, 2002 · PMID 12065164
Bacopa monnieri and other dietary supplements are not intended to diagnose, treat, cure or prevent any disease, and these statements have not been evaluated by the FDA. Talk to your clinician or pharmacist before starting a supplement, especially if you take prescription medicines. Product links on this page are paid partner links.