Synopsis

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

Tongkat ali (Eurycoma longifolia) is a traditional Southeast Asian herbal remedy that has been widely used for centuries to support male reproductive health and vitality. In recent years, its use to support the testes and male hormonal function has gained scientific attention. Several clinical and animal studies have investigated tongkat ali's effects on testosterone production, sperm quality, and overall reproductive function. Research has shown that tongkat ali may help increase serum testosterone levels in men, particularly those experiencing low testosterone (hypogonadism). Some studies have also reported improvements in sperm motility and semen volume following supplementation. The proposed mechanisms include stimulation of luteinizing hormone release and reduction of sex hormone binding globulin, both of which can increase free testosterone.

However, while the majority of studies report positive effects, many are small-scale or of limited duration, and some have methodological limitations. Meta-analyses suggest moderate evidence for its role in supporting testosterone levels and male fertility, but further large, high-quality trials are needed to confirm efficacy and establish optimal dosing.

In summary, tongkat ali is supported by both tradition and emerging scientific evidence for its use in supporting testes and male reproductive function, with the current body of science justifying a moderate evidence rating.

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