Discover the benefits, side effects, and recommended dosage of tongkat ali, a natural herbal supplement used to improve male fertility, testosterone levels, and reduce stress. Tongkat ali is an herbal supplement that may boost testosterone, relieve stress, and improve body composition, but it may also cause DNA damage and mercury poisoning. Learn more about its potential uses, risks, and recommended dosage from this article. What is Tongkat Ali? Eurycoma longifolia, also known as Longjack, Pasak Bumi, or Tongkat Ali, is an adaptogenic herb with a long history of use as a traditional medicine. Contrary to popular opinion, Tongkat Ali doesn’t increase testosterone levels in most fertile men. However, it can increase libido, lean mass, and a few other things that are usually associated with higher testosterone levels. This article is about the main benefits of Tongkat Ali, its potential side effects, the best ... Tongkat Ali suggested uses include for enhancement of male sexual function. Tongkat ali also has been used as an antimalarial. Learn about side effects, dosages, drug interactions, and more.