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
Clinical studies typically use 200–400 mg of Tongkat Ali. Most RCTs use 200–400 mg/day of standardized water extract (e.g., Physta, LJ100). Some studies go up to 600 mg/day.
- Effective range
- 200–400 mg
Clinical evidence
Moderate clinical evidence. Meta-analysis of 9 trials (590 participants) found statistically significant testosterone increases
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