Compare Supplements

1 mg once daily for male pattern hair loss (Propecia); 5 mg once daily for benign prostatic hyperplasia (Proscar). A prescription drug — use under a clinician.

Any time

Oral tablet (1 mg for hair, 5 mg for BPH)

Prescription-only and clinician-directed — this is a controlled substance, NOT a self-administered supplement, and we do not provide a non-medical dosing protocol. For context only: TRT for diagnosed hypogonadism is titrated to a mid-normal testosterone level. Intramuscular testosterone esters (cypionate/enanthate) are commonly dosed around 50–100 mg weekly (or ~100–200 mg every 2 weeks); long-acting testosterone undecanoate is dosed less frequently. Transdermal gels (~50–100 mg/day applied) and subcutaneous injection are alternative routes. Supraphysiologic anabolic-steroid doses are far higher, illegal, and dangerous — not a regimen this library endorses.

Any time

Clinician-prescribed testosterone (intramuscular ester or transdermal gel) for diagnosed hypogonadism — controlled substance, prescription-only

• Women who are or may become pregnant (handling crushed/broken tablets risks feminization of a male fetus)
• Children / adolescents
• Known hypersensitivity to finasteride

• PSA testing / prostate cancer screening
• Testosterone / anabolic androgens

• Use without a prescription / without medical supervision — testosterone is a Schedule III controlled substance and prescription-only
• Active prostate cancer or active breast cancer in men
• Untreated severe erythrocytosis / hematocrit above the safe threshold

• Anticoagulants / warfarin
• Other anabolic steroids / SARMs / hCG / aromatase inhibitors
• Insulin / glucose-lowering drugs