Tongkat Ali, Testosterone & SHBG Explained

Huberman's framing of tongkat ali is mechanistic. Rather than describing it as something that increases testosterone production, he describes it as acting on sex hormone-binding globulin, the protein that binds circulating testosterone and makes it biologically unavailable. Less binding means a larger free fraction from the same total. That single distinction explains why two honest studies can report very different-looking numbers: one may be measuring total testosterone and one free testosterone, and they are not the same quantity.

The rest of the segment is about expectations. He describes the effect as most detectable in people whose starting levels are already low, and largely absent in people at the top of the range. He frames the timeframe in weeks rather than days, discusses the general daily intakes that appear in the literature, and is emphatic about bloodwork before starting and again after roughly eight weeks, on the grounds that a supplement aimed at a hormonal pathway is worth measuring rather than guessing at.