Tongkat Ali
Tongkat Ali is a traditional Southeast Asian herbal supplement studied for supporting testosterone, male fertility, stress reduction, and sexual health.
Tongkat Ali (Eurycoma longifolia), known as Longjack, is a medicinal root used in Southeast Asian traditional medicine. Modern supplements aim to standardize its active compounds, especially eurycomanone.
The most robust evidence is for improvements in male fertility and stress. Evidence for testosterone boost and exercise performance is plausible but mixed in quality.
Supports male fertility
ModerateSupplementation may improve sperm quality—count, motility, and morphology—in men with fertility challenges.
May increase testosterone levels
ModerateData suggest moderate increases in total and free testosterone, particularly in aging men or those with low baseline testosterone.
Reduces cortisol and stress
ModerateTongkat Ali supplementation was associated with lower cortisol and improved self-reported mood and tension in stressed subjects.
Enhances sexual health and function
LimitedTongkat Ali is traditionally used to improve libido; clinical studies show possible benefit for erectile function and libido.
May support exercise performance and muscle strength
LimitedPreliminary studies suggest possible benefits for strength and body composition, but evidence remains limited.
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