Side Effects of Bacopa Monnieri

Bacopa monnieri (Bacopa monnieri, brahmi) is one of the most thoroughly studied nootropic plants, and it is generally considered well tolerated. However, "well tolerated" does not mean "free of side effects." In randomized trials, participants who received the extract complained of stomach problems noticeably more often than those who took placebo. Our editorial team has gathered what is actually known about bacopa's adverse reactions, how common they are and how to minimize them.

Where bacopa's side effects come from

Bacopa's main active compounds are triterpene saponins collectively called bacosides. They are credited with the effects on memory, antioxidant action and modulation of the brain's cholinergic and serotonergic systems. At the same time, saponins as a class of compounds are known for irritating the mucous membrane of the gastrointestinal tract: they have surfactant properties and can increase intestinal secretion and motility.

A second possible mechanism of adverse reactions is cholinergic. In experimental studies, bacopa extract affected acetylcholinesterase activity and acetylcholine levels. Acetylcholine regulates not only memory but also peristalsis, the secretion of digestive juices and heart rate. So in theory, some stomach complaints and the rare reports of a slowed pulse may be linked precisely to this effect.

A third factor is the product itself. The market offers whole-plant powder, standardized extracts with varying bacoside content, and tinctures. The concentration of active compounds among them differs several-fold, and so does tolerability. A separate problem is contaminants: bacopa grows in marshy soils and can accumulate heavy metals, and analyses of Ayurvedic products have repeatedly found them in dangerous amounts (Saper et al., 2004).

Finally, individual sensitivity, taking it on an empty stomach and the simultaneous use of other substances with sedative or cholinergic action all matter. In most cases bacopa's side effects are mild and resolve on their own, but understanding their origin helps you recognize in time the situations where a reaction is not normal.

Gastrointestinal reactions: the most common complaint

In clinical studies, gastrointestinal symptoms are the undisputed leader among side effects. In the study by Morgan and Stevens (2010) involving older adults, participants in the bacopa group reported more frequent bowel movements, stomach cramps and nausea more often than the placebo group. Similar complaints appear in other randomized trials, and systematic reviews (Pase et al., 2012; Kongkeaw et al., 2014) note that these are exactly what most often make participants stop taking it.

The typical picture looks like this: a few hours after the capsule, a feeling of heaviness or rumbling appears in the abdomen, and stools become more frequent or looser. Some people experience mild nausea, especially if the supplement was swallowed on an empty stomach. These symptoms are usually most pronounced in the first weeks of use and weaken later.

• Nausea and epigastric discomfort- often associated with taking it without food.
• Faster or looser stools- the most characteristic "saponin" effect.
• Cramps and bloating- occur less often, more often in people with a sensitive gut.
• Reduced appetite- noted occasionally, mainly at the start of a course.

For people with irritable bowel syndrome, inflammatory bowel disease or peptic ulcer disease, such reactions may be not merely unpleasant but may trigger a flare-up. So in these groups our editorial team advises discussing bacopa with a gastroenterologist in advance.

It is important to distinguish an expected mild reaction from warning signs. Severe abdominal pain, vomiting, blood in the stool, diarrhea lasting more than a few days are a reason to stop taking it and see a doctor, not to "wait out the adjustment."

Drowsiness, fatigue and effects on the nervous system

Although bacopa is positioned as a means to improve concentration, some people feel the opposite - mild sluggishness, drowsiness or "slowed thinking," especially in the first days. In the Ayurvedic tradition the plant has long been considered calming, and in laboratory studies its extracts have shown anxiolytic activity (Aguiar, Borowski, 2013).

In the study by Calabrese et al. (2008), older adults taking the extract showed improvements in anxiety and depressive symptoms compared with placebo. For some this is a desirable effect, but for an athlete who takes the supplement in the morning before training, a noticeable calming effect can reduce the subjective sense of energy.

A second rare effect is headache and dry mouth. They are described in isolated reports and are most likely linked to individual sensitivity. There are also reports of unusually vivid dreams, but there are no quality data on this, so we do not treat it as a proven effect.

A practical observation from many users is that shifting intake to the evening or to a time after meals reduces daytime drowsiness. Still, everyone's reaction is individual, and keeping a diary of how you feel during the first two weeks is the simplest way to understand your own tolerance.

If the sluggishness interferes with driving a car or operating machinery, intake should be paused until you consult a doctor. You should also avoid combining bacopa with alcohol and sedatives, as their effects can reinforce one another.

Rare and potential risks

Besides the common mild reactions, the literature discusses several potential risks that rest mainly on preclinical data or theoretical reasoning. They are worth knowing, even if the probability is low.

Regarding the thyroid gland: in experiments on mice, high doses of the extract raised thyroxine levels. Whether this is clinically significant for humans at ordinary doses is unknown, but patients receiving levothyroxine or antithyroid drugs should monitor their hormones during a course.

Regarding the liver: there are few serious cases of liver damage clearly linked specifically to bacopa in quality sources, yet in laboratory models the extract affected the activity of cytochrome P450 enzymes. This creates a theoretical possibility of altering drug metabolism, so simultaneous use with prescription medications should be discussed with a doctor.

Finally, data on safety during pregnancy and breastfeeding are practically absent, and there are few studies in children and adolescents (Kean et al., 2016). In the absence of safety evidence, our editorial team follows the precautionary principle.

How to reduce the risk of adverse reactions

Most of bacopa's side effects can be substantially softened by simple measures. The most effective of them is taking it with food. Bacosides are fat-soluble, so food containing fats not only reduces stomach irritation but may also improve absorption. It is no coincidence that in traditional Ayurvedic practice bacopa was often prepared in ghee.

The second principle is gradualness. Instead of taking the full dose right away, some people start with half the recommended amount during the first week. This gives the digestive system time to adapt. We covered what a typical dosing scheme for the supplement looks like in detail in a separate article on taking bacopa.

1. Take the supplement during or immediately after a meal, not on an empty stomach.
2. Start with a smaller amount and increase it over 1-2 weeks.
3. Choose a standardized extract from a manufacturer with laboratory testing for heavy metals.
4. Do not combine bacopa with alcohol and sedatives.
5. Keep a short well-being diary during the first weeks.

You should not exceed the doses used in studies on your own: a larger amount does not speed up the cognitive effect but does increase the likelihood of stomach complaints. Bacopa's cognitive action develops gradually, over weeks, so "forcing" it with a higher dose is pointless.

If, even while following these rules, the symptoms do not go away after two or three weeks, this plant may simply not suit your body. In that case it is better to stop taking it than to endure constant discomfort for the sake of an effect that is moderate anyway in healthy young people.

Editorial conclusions

Bacopa monnieri has a relatively favorable safety profile, but its most common side effects - nausea, cramps and faster bowel movements - are real and confirmed by controlled studies. They are usually mild and diminish if you take the supplement with food and reach the full dose gradually.

Less often there are drowsiness, headache and dry mouth. Potential risks - effects on the pulse, thyroid gland and drug metabolism - are based mostly on preclinical data, yet for people with chronic conditions they are a weighty argument in favor of consulting a doctor.

Product quality directly affects safety: a standardized extract tested for heavy metals is a far more reliable choice than an unidentified powder.

We also recommend reading our materials "Who Should Not Take Bacopa Monnieri," "How to Take Bacopa Monnieri: Dosage, Timing, Duration" and "Bacopa Monnieri: Forms and Which to Choose."

References

1. Morgan A, Stevens J. Does Bacopa monnieri improve memory performance in older persons? Results of a randomized, placebo-controlled, double-blind trial. J Altern Complement Med. 2010;16(7):753–759.
2. Calabrese C, Gregory WL, Leo M, et al. Effects of a standardized Bacopa monnieri extract on cognitive performance, anxiety, and depression in the elderly: a randomized, double-blind, placebo-controlled trial. J Altern Complement Med. 2008;14(6):707–713.
3. Pase MP, Kean J, Sarris J, et al. The cognitive-enhancing effects of Bacopa monnieri: a systematic review of randomized, controlled human clinical trials. J Altern Complement Med. 2012;18(7):647–652.
4. Kongkeaw C, Dilokthornsakul P, Thanarangsarit P, et al. Meta-analysis of randomized controlled trials on cognitive effects of Bacopa monnieri extract. J Ethnopharmacol. 2014;151(1):528–535.
5. Aguiar S, Borowski T. Neuropharmacological review of the nootropic herb Bacopa monnieri. Rejuvenation Res. 2013;16(4):313–326.
6. Kean JD, Downey LA, Stough C. A systematic review of the Ayurvedic medicinal herb Bacopa monnieri in child and adolescent populations. Complement Ther Med. 2016;29:56–62.
7. Saper RB, Kales SN, Paquin J, et al. Heavy metal content of ayurvedic herbal medicine products. JAMA. 2004;292(23):2868–2873.