Dr. Rhonda Patrick on Instagram: "Tongkat ali is one of the few “testosterone-boosting supplements” that shows promise. 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. Make sure your supplement contains standardized extracts of the bioactive compound eurycomanone and are third-party tested."