Plantaginaceae
Bacopa monnieri
Brahmi · Water hyssop
- Part used
- aerial
- Native range
- Wetlands across the Indian subcontinent, Southeast Asia, Australia and the Americas
- Morphology
- A low creeping succulent herb of wet ground, with small fleshy oblong leaves and pale blue-white flowers. Roots at the nodes and forms mats.
What is in it
Evidence
Among the better-studied Ayurvedic herbs. Several small randomised trials report modest improvements in memory acquisition and recall in healthy adults, generally after twelve weeks rather than acutely. Effect sizes are small and independent replication is thin.
Safety
Gastrointestinal upset is common and is the usual reason people stop. Bradycardia is reported. Thyroid hormone effects have been observed in animal work. Cholinergic activity raises theoretical concern with anticholinergic and cholinergic drugs.
Interactions: Theoretical with cholinergic and anticholinergic drugs; Possible additive with thyroid medication; Additive sedation reported
Regulatory: Permitted as a listed medicine ingredient in Australia.
How the traditions classify it
Three systems, rating the same plant. Where they disagree, none of them is correcting the others — they are separate frameworks that arrived at their categories independently.
Historical use
Recorded in Ayurvedic texts from the Charaka Samhita onward as a plant for the mind, and traditionally given to students. The name brahmi is confusingly also applied to Centella asiatica, a wholly different plant.
Recorded as history and attributed where possible. Long use establishes that a plant was widely used, not that it worked, and not that it was safe.
Worth knowing
Brahmi is a name, not a plant, and that is the first thing to know about it. It is applied to Bacopa monnieri and to Centella asiatica — gotu kola — which are in different families, contain different compounds and are used somewhat differently. Which one a product contains depends on where it was made.
It is also one of the few Ayurvedic herbs whose traditional indication is narrow enough to test. Medhya rasayana means, specifically, a rejuvenative for the intellect. That is a claim about cognition, and cognition can be measured — which is why bacopa has a real trial literature while most of the materia medica does not.
Nomenclature verified against GBIF backbone taxonomy.