Tongkat Ali, a root extract, most credibly raises usable testosterone by freeing it from a binding protein, with added signals for better libido, mood, and lower stress hormones. Effects are strongest in men with low, borderline, or stress-suppressed testosterone and minimal in those already healthy. Key hazards are contaminated products and rare liver injury; verified products and follow-up bloodwork matter. (Full Review)
| Marker | Target | Why |
|---|---|---|
| Total Testosterone | ~600–900 ng/dL | Primary efficacy marker |
| Free Testosterone | ~15–25 pg/mL | Usable, unbound fraction most affected |
| SHBG | ~20–40 nmol/L | Explains free vs. total testosterone |
| LH | ~4–8 mIU/mL | Shows pituitary drive to the testes |
| Estradiol (E2) | ~20–30 pg/mL | Detects excess conversion of testosterone to estrogen |
| PSA | <1.0–2.5 ng/mL | Prostate safety with androgen support |
| ALT/AST | <30 U/L | Liver safety given rare hepatotoxicity reports |
| Hematocrit | ~40–48% | Detects blood thickening from androgen rise |
Cadence: Baseline, at 8–12 weeks, then every 6–12 months; PSA and hematocrit at least annually in older men