Also known as: Eurycoma longifolia, Longjack, Malaysian Ginseng
Tongkat Ali (Eurycoma longifolia) is a Southeast Asian medicinal root studied for its testosterone-supporting, ergogenic, and adaptogenic properties. Clinical trials demonstrate improvements in male hormonal profiles, physical performance, and stress resilience.
Tongkat Ali (Eurycoma longifolia) is a flowering plant native to Southeast Asia whose root extract has been used traditionally as an aphrodisiac and energy tonic. Modern research has identified eurycomanone and its glycoside derivatives as the primary bioactive compounds, which appear to support testosterone levels through multiple mechanisms: inhibiting aromatase (estrogen conversion), reducing sex hormone-binding globulin (SHBG), and modulating cortisol release through hypothalamic-pituitary-adrenal (HPA) axis regulation. Randomized controlled trials have demonstrated significant improvements in free testosterone levels, sexual well-being, and muscle strength in both aging men and physically active adults. Tongkat Ali also exhibits adaptogenic properties, with clinical evidence showing reductions in cortisol, tension, anger, and confusion in moderately stressed individuals. It is available as standardized root extracts (often 100:1 or 200:1 concentration ratios), capsules, and powders.
A meta-analysis and multiple RCTs show that Tongkat Ali supplementation (200–400 mg daily) significantly improves total and free testosterone levels in men with age-related hormonal decline and in physically active adults.
A randomized controlled trial in moderately stressed adults found that 200 mg daily of Tongkat Ali extract significantly reduced salivary cortisol by 16% and improved tension, anger, and confusion scores.
Clinical trials demonstrate that Tongkat Ali supplementation improves muscle strength, lean body mass, and exercise performance in both recreationally active men and aging populations.
Once daily in the morning with food
Use water-extracted root standardized to ≥2% eurycomanone. Effects typically observed within 2–4 weeks. Cycling (5 days on, 2 days off) is sometimes recommended.
Once daily in the morning
Lower doses (200 mg) have demonstrated cortisol-lowering effects in clinical trials.
Clinically validated dosing and testosterone support
Traditional preparation and flexible dosing
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