Bacopa monnieri (L.) Wettst. · herb
Evidence tier: moderate
A classical Ayurvedic nervine tonic. Improves memory, learning speed, and cognitive resilience, but slow acting, build over months.
Bacosides are thought to modulate cholinergic signalling, act as antioxidants in neural tissue, and promote dendritic branching in the hippocampus in animal models. The animal work is reasonably consistent. Whether any of it is the operating mechanism behind the modest processing speed effect measured in humans is unknown, and the slow onset, which is real, is usually attributed to a synaptic remodelling process rather than an acute neurotransmitter effect, though that explanation is a hypothesis rather than a demonstrated fact.
Moderate, and this is one of the ingredients in the batch where the signal is real rather than imagined. It is also smaller and narrower than the seed suggests. The anchor is Kongkeaw's 2014 meta analysis of randomised controlled trials (PMID 24252493): nine trials, 518 subjects, with 437 contributing to the pooled analysis. It found improved cognition on two measures, a shortened Trail B time (17.9 ms faster, 95 percent CI 24.6 to 11.2) and a decreased choice reaction time (10.6 ms faster, 95 percent CI 12.1 to 9.2). Look closely at WHAT those two measures are: Trail B and choice reaction time index attention, executive switching and PROCESSING SPEED. They are not memory tests. The memory picture is messier. The earlier systematic review of randomised controlled human trials found bacopa improved performance on 9 of 17 tests of memory free recall, which is a coin flip dressed as a result, and reviewers note there is little or no research in reasoning, language and several other domains. In the DISEASE population the evidence collapses entirely: a systematic review of bacopa for dementia due to Alzheimer disease found all five trials at HIGH risk of bias with evidence quality rated VERY LOW, and human studies in Alzheimer disease are inconclusive. So the defensible claim is a modest improvement in cognitive processing speed and attention in healthy adults, from small trials, building over about 12 weeks. It is not a memory drug and it is not a dementia treatment. The trials are small, which is the main limit on the grade, but they are randomised, placebo controlled, replicated and pooled, which is more than most herbs in this database can say.
300 to 450 mg daily of an extract standardised to bacosides, which is the band the trials in the meta analysis used, most commonly 300 mg daily. Taken with food. The effect requires sustained dosing; single doses do not produce it.
300 to 450 mg standardised extract (50% bacosides) daily with food. Take with meals, fat improves absorption.
Onset: ~84 days
May cause mild nausea or fatigue initially; start with lower dose. Generally well tolerated long term.
Pregnancy: avoid
Breastfeeding: avoid
Active compounds: bacoside A, bacoside B, bacopasides, bacosaponins
Remedies using Bacopa · Browse by body system · Check it against what you take
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.