Pasak Bumi (Tongkat Ali)
Eurycoma longifolia Jack.Plant Part & Mechanism
Root — mature trees (10–25 years old) yield significantly higher eurycomanone concentrations.
Inhibits sex hormone-binding globulin (SHBG) to promote bioavailable free testosterone. A 12-week RCT using 300 mg/day demonstrated significant improvements in physical endurance, daily vigor, and stamina recovery in active men.
Standard Dosage
200–400 mg standardized extract/day. A cycle of 5 days on / 2 days off is practiced by some clinicians, though clinical data for pulsing regimens remains emerging.
Safety & Interactions
Contraindications: severe renal impairment. Drug interactions: CYP3A4 inhibitors. Avoid in men with a personal history of hormone-dependent prostate conditions.
Standardized Marker Compounds
Primary androgenic bioactive marker
Adaptogenic action
Anti-estrogenic potential
Extraction Ratio
100:1 industry standard (raw root → dry extract)