The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
For those that have lower than desired levels of testosterone or too much sex hormone binding globulin, it turns out that 400 milligrams per day of something called "tongkat ali," which is a form of ginseng, can actually help increase levels of free testosterone. Many people experience a positive subjective effect and some objective affects as well, meaning increases in free testosterone when they do blood analysis.
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The dosage that I've been using for years now is, it's 400 milligrams taken once a day, typically early in the day, 'cause it can kind of have a mild stimulant effect, very mild. And I know that some of the products out there recommend dosages that are much higher. Anytime I've taken more than 400, I don't feel very good.
In randomized controlled studies, 200–400 mg per day for 1–3 months elevates testosterone levels by 30–40% and normalizes levels in hypogonadal men. Particularly those with low or borderline levels, older adults, or those under stress.
Supplementing with Tongkat Ali can boost testosterone by as much as 100-200 ng/dL It primarily works by suppressing sex hormone-binding globulin (SHBG) and increasing steroidogenesis—enhancing local testosterone production in the testes
and it seems to work to the tune of 100 to 200 nanograms per deciliter for some people and depends on how potent of a standardized uh extract you get.