Eurycoma longifolia (Tongkat Ali)

Human RCTs show testosterone increase in hypogonadal men [citation:37]. Aromatase inhibition shown in vitro.

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Eurycoma longifolia (Tongkat Ali) affects the following biological pathways. Click any mechanism to see everything else that affects it.

Aromatase converts testosterone into estradiol. Inhibiting it keeps more testosterone as testosterone.

Hypothalamus releases GnRH → pituitary releases LH → Leydig cells produce testosterone.

Chronic cortisol elevation impairs recovery, sleep, and testosterone. Adaptogens may modulate it.