Gotu Kola — Research Profile

In some Ayurvedic traditions, both gotu kola (Centella asiatica) and bacopa (Bacopa monnieri) are called "brahmi." However, they are completely different plants with different active compounds. In North Indian Ayurvedic tradition, brahmi typically refers to Bacopa monnieri, while in South Indian tradition, it may refer to gotu kola. To avoid confusion, use the botanical names. Both are medhya rasayanas (brain tonics) but work through different mechanisms.

Gotu kola has the strongest evidence of any herb for wound healing and collagen synthesis. TECA extract has been shown to improve collagen formation and scar maturation in clinical trials ^[3]. For scars and stretch marks, both oral supplementation and topical application of centella-containing creams may be beneficial. Many commercial scar creams now include Centella asiatica extract as an active ingredient.

Yes, cycling is recommended due to rare reports of hepatotoxicity with prolonged continuous use. A common protocol is 4-6 weeks on, followed by 2 weeks off. Monitor for signs of liver stress (fatigue, dark urine, abdominal pain) and discontinue if they occur. This cycling approach is also consistent with traditional Ayurvedic practice.

No trial has compared delivery forms head-to-head, so there is no proven 'best' one. Most clinical evidence used oral standardized triterpene extracts titrated for asiaticoside and madecassoside, which give a defined, low milligram dose rather than variable whole-leaf material. A standardized oral extract is therefore the most defensible choice for reproducing study conditions, while bulk dried-leaf products deliver a far less predictable amount of active triterpenes.

The best-supported uses are chronic venous insufficiency and wound healing (including striae gravidarum), which have controlled clinical evidence behind the standardized triterpene extract. Cognitive and mood claims are weaker and mixed: a small trial in healthy elderly found improved working memory and mood after two months, and a single dose showed an acute anxiolytic effect, but a randomized trial in older adults with mild cognitive impairment found gotu kola added no cognitive benefit beyond exercise alone. Broader sedative, antidepressant, and antimicrobial effects remain experimental and clinically unproven.

There is no single established dose, and the right number depends entirely on the product form. Purified or titrated triterpene extracts are typically taken at 60 to 120 mg daily, while capsules or powders of dried leaves run 600 to 1800 mg daily. Cognition studies have used roughly 250 to 750 mg of extract once daily, or 500 mg twice daily, so match your intake to what the label's standardization implies rather than a generic figure.

Time of day has not been directly compared in trials. Because a single dose produced a measurable calming effect within 30 to 60 minutes, taking it when you want that effect makes practical sense, and some people prefer evening dosing for that reason. Cognition studies simply dosed it once daily or split into two daily doses without testing timing, so there is no evidence that morning versus night changes results.

In controlled trials the extract was generally well characterized, and a single 12 g dose produced no meaningful change in mood, heart rate, or blood pressure. The clinically important adverse effect is uncommon but serious: idiosyncratic hepatocellular liver injury with jaundice, which LiverTox rates a probable rare cause (score C), typically appearing 3 to 8 weeks into use and reversing after stopping. Topical preparations can also cause contact dermatitis.

Human drug-interaction data are sparse, so most concerns are theoretical rather than documented in trials. The clearest one follows from its liver signal: because gotu kola is a probable rare cause of hepatocellular injury, combining it with other drugs that can stress the liver is best approached cautiously and with monitoring. Given its measured calming effect, an additive interaction with sedatives or other CNS depressants is also plausible but unproven. Tell your prescriber before combining it with any long-term medication.

The strongest case is for people with chronic venous insufficiency or slow-healing wounds, where the standardized triterpene extract has the best controlled clinical evidence. Those interested in mild cognitive or mood support should keep expectations modest, since benefits were small in healthy elderly volunteers and one trial in older adults with mild cognitive impairment found no added cognitive benefit beyond exercise alone. Because gotu kola is a probable but rare cause of clinically apparent liver injury, anyone with existing liver problems may reasonably want to be cautious and check with a clinician first, though no formal contraindication has been established.

Onset depends on the goal. An acute calming effect has been measured within 30 to 60 minutes of a single 12 g oral dose, which reduced the acoustic startle response in healthy adults. Cognitive and mood benefits build more slowly: in healthy elderly volunteers, working memory and self-rated mood improvements were assessed at one and two months and were clearest by two months on the highest dose. Expect days-to-weeks for any subjective calm and roughly one to two months for cognitive changes.

Long-term human safety data are limited and mostly cover weeks to a few months, not years. The main concern is that Centella asiatica is a probable rare cause of clinically apparent liver injury (LiverTox likelihood score C), with hepatocellular injury and jaundice reported 3 to 8 weeks into use in case reports, reversing within 1 to 2 months after stopping. If you use it daily, watch for fatigue, dark urine, or yellowing of the skin/eyes and stop promptly if they appear.

No formal tolerable upper limit has been set. The most serious documented harm is rare, idiosyncratic hepatocellular liver injury rather than a simple dose threshold: case reports involved people using centella for weight loss or acne who developed jaundice after 3 to 8 weeks, which resolved after stopping. Because purified extracts are dosed at only 60 to 120 mg daily while dried-leaf powders run 600 to 1800 mg daily, matching the dose to the product form matters more than pushing the amount higher.

There are no controlled studies of gotu kola combined with other supplements, so any pairing is unproven. Two cautions follow from its known effects: because a single dose attenuated the startle response, stacking it with other sedating or calming botanicals could compound drowsiness, and because it is a probable rare cause of liver injury, combining it with other potentially liver-taxing herbs is best avoided. Introduce it on its own first so any reaction can be traced to it.

The active constituents are pentacyclic triterpenes, chiefly asiaticoside and madecassoside, so look for an extract standardized to a stated triterpene percentage rather than an unquantified 'gotu kola powder.' Note the form on the label: titrated triterpene extracts are dosed around 60 to 120 mg, whereas dried-leaf capsules and powders are 600 to 1800 mg, so the number alone is meaningless without context. Third-party purity testing is worth prioritizing, since possible contamination was not ruled out in some of the liver-injury case reports.