Tongkat ali, or longjack, is an herbal supplement that comes from the roots of the green shrub tree Eurycoma longifolia, which is native to Southeast Asia. It’s used in traditional medicine in Malaysia, Indonesia, Vietnam, and other Asian countries to treat malaria, infections, fevers, male infertility, and erectile dysfunction. Tongkat Ali has been known to increase testosterone levels in men, Effects of inadequate testosterone levels include low libido, erectile dysfunction, and in some cases, infertility. Since compounds in tongkat ali help boost low testosterone, it could treat these issues. Tongkat is also popular among athletes for its ergogenic aid, which means it aids the body's adaptive response when exercising. Other benefits of tongkat is; weight loss, immune enhancer, reducing blood sugar, inflammation, leukemia, and breast cancer.