About Tongkat Ali
Tongkat Ali (Eurycoma longifolia) is a Southeast Asian herb studied for testosterone support and stress. A 2022 meta-analysis (9 RCTs, 590 participants) found statistically significant increases in total testosterone compared to placebo. A 4-week RCT (63 adults, 200 mg/day) showed significant reductions in cortisol and improvements in tension and anger profiles. May improve male fertility parameters — a 12-week study in idiopathic male infertility showed improved sperm concentration and motility. Eurycomanone is the primary bioactive quassinoid. Standardized water extracts are best studied.
What Tongkat Ali supports
- May support healthy testosterone levels
- May reduce cortisol and improve stress markers
- May support male fertility parameters
How much Tongkat Ali to take
The RDA prevents deficiency. The effective range is what clinical trials used to actually move the outcome.
Effective
200–400
mg
Most RCTs use 200–400 mg/day of standardized water extract (e.g., Physta, LJ100). Some studies go up to 600 mg/day.
Clinical evidence
Moderate clinical evidence. Meta-analysis of 9 trials (590 participants) found statistically significant testosterone increases
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