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Also known as: Eurycoma longifolia, Longjack, Malaysian Ginseng
A Southeast Asian adaptogenic root with robust clinical evidence for increasing free testosterone, improving stress hormones, and enhancing male reproductive health.
Tongkat Ali (Eurycoma longifolia) is a flowering plant native to Malaysia, Indonesia, and Vietnam. It has emerged as one of the most evidence-backed natural testosterone optimizers, with multiple RCTs showing consistent effects on free testosterone, cortisol, and male fertility.
Most testosterone in the blood is bound to SHBG (sex hormone-binding globulin) and is inactive. Only "free" testosterone exerts biological effects. Tongkat Ali's eurypeptides bind to SHBG, releasing testosterone into its free, active form — effectively increasing usable testosterone without increasing total production.
Eurypeptides and eurycomanone from Tongkat Ali bind to SHBG, releasing bound testosterone into its free, bioactive form. Quassinoids support Leydig cell function and may directly stimulate testosterone synthesis. Cortisol reduction occurs through HPA axis modulation. Anti-estrogenic effects through aromatase inhibition are also reported.
Typical Dose
200-400mg
Frequency
Daily (morning)
Cycle Length
8 weeks on, 2 weeks off
Half-Life
~6-8 hours
Multiple RCTs for testosterone, fertility, and stress. Physta extract most studied. Published in JISSN, Andrologia, Evidence-Based Complementary Med.
Well-tolerated. Rare: insomnia (if taken late), restlessness, mild GI discomfort. Avoid in hormone-sensitive cancers. May interact with diabetes medications (glucose-lowering effect). Not studied in pregnancy/breastfeeding.
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