Gotu Kola (Centella asiatica) for Venous Insufficiency and Cognition: The Trial Record

Centella asiatica, known as gotu kola, brahmi, or pegaga across South and Southeast Asia, contains triterpene saponins (asiaticoside, madecassoside) and aglycones (asiatic acid, madecassic acid) that have been studied for skin wound healing, venous insufficiency, and cognition. The clinical signal is strongest in the first two domains.

Chronic venous insufficiency

The triterpene fraction of Centella, marketed as TTFCA (total triterpenic fraction of Centella asiatica) and sold as Madecassol or Centellase, has trial data for CVI dating to the 1980s. A 2017 systematic review of seven RCTs found that TTFCA 60-180 mg/day improved ankle edema, capillary filtration rate, and symptomatic scores versus placebo over four to 12 weeks [1]. The mechanism appears to involve stimulation of collagen synthesis in vein walls and reduction in capillary leakage. Effect sizes are comparable to MPFF flavonoids in head-to-head comparisons.

Wound healing

Topical Centella preparations accelerate granulation and re-epithelialization in venous leg ulcers, post-surgical wounds, and burns. A 2014 trial in 64 diabetic foot ulcer patients showed faster closure with Centella ointment versus standard care [2]. The TGF-beta1 and fibroblast-stimulating effects of asiaticoside have been characterized in vitro and in animal models [3].

The cognition data is weaker

Ayurvedic and Traditional Chinese Medicine use of gotu kola as a brain tonic has generated small modern trials. A 2016 RCT in 28 elderly adults with mild cognitive impairment compared 750 mg/day Centella extract with placebo for 6 months and reported improvements on working-memory tasks [4]. A separate trial in healthy older adults found dose-dependent improvements in mood and alertness [5]. Sample sizes are small, blinding is inconsistent, and effect sizes are modest — the venous indication has substantially better evidence.

Safety

Centella is well tolerated. Rare hepatotoxicity has been reported with long-term oral use, and case reports have implicated combination herbal products rather than purified extracts [6]. Contact dermatitis is documented with topical use in sensitized individuals. Pregnancy and breastfeeding data are insufficient; avoid use in those settings.

What to look for

For venous indications, products standardized to TTFCA delivering 30 mg three times daily match the trial protocols. For wound healing, 0.5-1 percent Centella ointments applied twice daily are the formulation used in most positive trials [7]. Raw-leaf powders sold without standardization vary widely in triterpene content and may not deliver equivalent dosing.

The post-thrombotic and lymphedema applications

Beyond garden-variety venous insufficiency, Centella has been used as an adjunct in post-thrombotic syndrome and chronic lymphedema. Small trials in patients with prior deep-vein thrombosis showed reductions in calf circumference and symptom scores with TTFCA combined with compression versus compression alone [8]. The mechanism overlaps with the underlying CVI evidence — improved capillary integrity and reduced inflammatory infiltrate in chronic venous-stasis tissue.

Bottom line

For chronic venous insufficiency and wound healing, gotu kola has trial-supported uses that have been recognized in European pharmacopoeial monographs. For cognition, the data are early and largely from small Asian trials of variable quality — promising but not yet a basis for confident clinical recommendation. Patients should source standardized triterpene-fraction products rather than raw leaf powder of unknown alkaloid content, and should be aware that long-term oral use over many months has occasionally been associated with reversible liver-enzyme elevations.

Patients interested in gotu kola should also know that the herb has occasional reports of mild sedation at higher doses, which may be useful in some applications and unwelcome in others. Long-term oral use beyond six continuous months is not well studied; periodic two-month breaks are a reasonable precautionary practice if the herb is being used chronically rather than for an acute wound or venous flare.