How we rate
“Strong” = several concordant meta-analyses or systematic reviews. “Moderate” = one synthesis, or several controlled trials. “Limited” = early trials only. The rating is about the quality of the studies, not about how useful the supplement is.
Bacopa
An Ayurvedic herb sold as a memory booster. Unlike many "brain" supplements, its trials in healthy adults are numerous and point in the same direction.
Benefits
- In 76 adults aged 40 to 65, 3 months of supplementation improves the retention of new information, without changing initial learning speed or attention
- In 98 healthy individuals over 55, 300 mg per day for 12 weeks significantly improves verbal learning, memory acquisition, and delayed recall compared to placebo
- A meta-analysis of 9 trials (518 participants) shows a significant improvement in attention speed (reaction time, Trail B test) after at least 12 weeks of supplementation
- A systematic review of 6 trials in adults without dementia finds a consistent improvement in memory (9 tests out of 17), with more limited evidence on reasoning or language
- In 54 individuals over 65, 300 mg per day for 12 weeks also improves delayed memorization and reduces depression and anxiety scores
Precautions
Trials mainly report mild digestive issues (more frequent stools, cramps, nausea), with no sign of toxicity. Also good to know: the benchmark systematic review highlights that the benefits mainly concern memory, while evidence on reasoning or language remains limited; it calls for trials comparing different doses, which has not yet been done rigorously. Almost all trials last a minimum of 12 weeks: a rapid effect is not what these studies show.
Recommended dosage
300 to 450 mg per day of a standardized extract for at least 12 weeks — this is the protocol used in almost all positive trials. The effect is not immediate.
Did you know?
Bacopa does not make you faster at learning new information, but it helps you forget it less afterward: studies show that learning speed remains unchanged, while memory retention improves markedly.
What the studies say
Cette revue synthétise les recherches sur le Bacopa monnieri, plante ayurvédique traditionnellement utilisée comme tonique cérébral et stimulant de la mémoire. Plusieurs essais randomisés en double aveugle chez l'humain confirment son intérêt comme améliorateur cognitif, avec une bonne tolérance générale. Les mécanismes proposés incluent une action antioxydante, une inhibition de l'acétylcholinestérase, une réduction du bêta-amyloïde et une meilleure circulation cérébrale. Des études de toxicité à long terme chez l'humain restent toutefois nécessaires.
Aguiar S, Borowski T. — Rejuvenation research (2013) — View the source study
For information only: not a substitute for medical advice. Dietary supplements are not a replacement for a varied, balanced diet. Learn more