Evidence supporting the use of: Eurycoma Longifolia
For the body system: Testosterone

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Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Eurycoma longifolia, commonly known as Tongkat Ali, is traditionally used in Southeast Asian medicine to enhance male virility and treat various ailments, including sexual dysfunction and fatigue. Recent scientific investigations have explored its potential to support the testosterone body system. Several clinical studies and animal experiments suggest that Eurycoma longifolia extract may increase serum testosterone levels, particularly in men with low baseline testosterone or those experiencing age-related decline. Mechanisms proposed include stimulation of the hypothalamic-pituitary-gonadal axis and reduction of sex hormone-binding globulin (SHBG), thereby increasing free testosterone. A number of randomized controlled trials (RCTs) involving middle-aged and older men have found modest but statistically significant increases in testosterone levels, improved sexual function, and better mood compared to placebo. However, sample sizes are often small, study durations short, and some trials report no effect, highlighting the need for larger, high-quality studies. Reviews and meta-analyses generally conclude there is preliminary support for Eurycoma longifolia’s testosterone-boosting effects, but recognize that the overall quality of evidence is moderate at best. In summary, the use of Eurycoma longifolia to support testosterone levels has both traditional roots and emerging scientific validation, with current evidence suggesting mild to moderate efficacy, primarily in populations with low testosterone or related symptoms.

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