
Tongkat Ali, also known as Eurycoma longifolia or Longjack, is a herbal medicinal plant found in Southeast Asia. It is widely used in traditional medicine and modern supplementation to support hormonal health and vitality. It is specifically noted for its ability to increase free, unbound testosterone by potentially lowering sex hormone binding globulin (SHBG). The Indonesian variety is often cited as being particularly potent for its effects on libido.
Another substance that has been shown to increase libido across a range of human populations is so-called Tongat Ali.
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"Huberman recommends Tongkat Ali, specifically mentioning a 400mg daily dosage, as a tool to increase free testosterone and improve libido based on clinical observations."