Gotu Kola: The Second Herb With Real Evidence

What it is 🌿

Centella asiatica — gotu kola, or Indian pennywort — is a low-growing marsh plant used in Ayurvedic and traditional Chinese medicine for centuries, historically for wound healing and skin conditions. Unusually for a traditional herb, the wound-healing reputation turned out to point at a real mechanism.

The researched preparation is a titrated extract standardised to its triterpene fraction: asiaticoside, madecassoside, asiatic acid and madecassic acid. These compounds appear to stimulate collagen synthesis and support the connective tissue of the vessel wall.

A different mechanism from horse chestnut

This is the key point, and the reason seeing both on one label is a genuine formulation decision rather than ingredient padding.

Aescin, from horse chestnut, works largely on venous tone and vessel permeability. Centella works on the structural integrity of the capillary wall itself. They address different parts of the same problem — too much fluid escaping into the tissue and too little pressure moving it back. 🩸

What the human research shows 📊

Studies of titrated extract of Centella asiatica in chronic venous insufficiency and venous microangiopathy have reported improvements in capillary filtration rate — a direct measure of how much fluid leaks from the capillaries into the tissue — along with reductions in ankle oedema and subjective heaviness.

Honest framing: this body of work is smaller than the horse chestnut literature, several trials come from the same research groups, and sample sizes are modest. It is a real evidence base, not a definitive one. Call it moderate rather than strong.

Trial dosing sits around 60 mg to 120 mg daily of standardised triterpene fraction, often split into two or three doses, with studies typically running 4 to 12 weeks.

Safety and what it is not ⚠️

Generally well tolerated in trials, with mild digestive upset the most common complaint. The points worth knowing:

• Liver. Isolated case reports of liver injury at higher intakes or prolonged use. People with liver conditions should take medical advice, and continuous long-term use is generally not advised.
• Pregnancy and breastfeeding. Not established as safe; avoid.
• Sedatives and anaesthesia. May add to sedating medication. Stop before surgery.

Gotu kola is also marketed heavily for memory, anxiety and skin ageing; the venous research is the strongest part of its file. And like every oral botanical it does not move lymph directly — lymph has no pump. See what actually moves lymph.

Note the standardisation point: a label reading “gotu kola 100 mg” without a percentage tells you very little, because raw leaf powder and titrated extract are not interchangeable. See what standardisation means.