Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Eurycoma longifolia, also known as Tongkat Ali, has gained popularity in the bodybuilding community primarily due to its purported effects on testosterone levels, muscle strength, and exercise performance. Several studies have investigated its potential benefits for bodybuilders, focusing on hormonal balance, muscle mass, and recovery. A few small-scale human studies suggest that supplementation with Eurycoma longifolia extract may help increase or restore testosterone levels in men experiencing stress, aging, or hypogonadism. Some of these studies also report improvements in muscle strength and reductions in body fat, which are relevant for bodybuilding.

For example, a 2013 randomized controlled trial found that men who supplemented with Eurycoma longifolia extract for five weeks experienced significant improvements in muscle strength compared to placebo. Other studies have reported increased free testosterone and improved libido, but direct evidence for significant increases in muscle mass or performance in well-trained athletes remains limited. The overall quality of evidence is moderate to low, with most studies being of short duration, small sample size, or lacking rigorous controls.

In summary, while there is a scientific rationale and some early evidence for the use of Eurycoma longifolia to support bodybuilding—especially via hormonal pathways—the current body of evidence is not robust. Larger, high-quality clinical trials are needed to confirm its efficacy and safety for this specific purpose.

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