Pure tongkat ali extract capsules, such as SD-200 Genuine Tongkat Ali Extract, are available from online retailers such as Amazon.com. The SD-200 formula is the most potent one for sale, containing 400 milligrams per capsule with no other ingredients added, claims Pure Science Supplements.
Tongkat ali is an evergreen shrub-tree that is commonly found in Southeast Asia, notes WebMD. Advocates claim that tea made from the plant improves sexual ability and virility in Malaysian men, which is why there is a demand for supplements made from the plant. The supplements are used for treating erectile dysfunction and male infertility, as well as for increasing interest in sex, boosting athletic performance, reducing body fat and body building. The plant is also used for malaria, fever, ulcers, tuberculosis, high blood pressure, cough, bone pain, headache, diarrhea and cancer. There is some evidence that the plant treats male infertility, but there is insufficient evidence for all other claims.
The plant works to treat infertility because it has several chemicals that affect how the body produces testosterone, explains WebMD. The plant is possibly safe when taken orally for up to nine months and should not be taken by those who are pregnant or breast-feeding. Dosing is also dependent on the health and age of a user, so it is important to follow directions on product labels and to consult a qualified health professional before using the product.