Tongkat Ali, also known as Eurycoma longifolia or Longjack, is a herbal plant native to Southeast Asian countries like Malaysia, Indonesia, Thailand, and Vietnam. It has been used in traditional medicine for centuries due to its purported health benefits, including its potential to boost testosterone levels and improve sexual function. 
The primary active compounds in Tongkat Ali are believed to be quassinoids and eurycomanone, which are thought to have various physiological effects on the body. One of the most commonly marketed benefits of Tongkat Ali is its potential to enhance testosterone levels. Testosterone is a hormone that plays a crucial role in muscle growth and strength development, among other functions.
However, it’s important to note that while there is some evidence suggesting that Tongkat Ali may have positive effects on testosterone levels in animals and humans, the scientific research is not entirely consistent or conclusive. Some studies have reported improvements in testosterone levels, while others have not found significant effects.
As for its direct impact on muscle building and strength, there is limited scientific evidence to support the notion that Tongkat Ali alone can lead to significant gains in muscle mass and strength. Building muscle and strength primarily require a combination of regular resistance training, proper nutrition, sufficient rest, and other lifestyle factors.
If you want to give it a try the dosage recommendations for testosterone boosting is 200–600 mg/day. For sexual health and libido, a daily dose of 200–400 mg seems to be effective, which may be divided into 1–2 doses per day.
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