Bulbine natalensis stem extract can raise testosterone and enhance male sexual behavior in rats at mid-range doses; human hormone trials are absent. The same animal doses stress liver and kidney and worsen blood lipids, while one short human safety study was largely reassuring. Longevity-focused use supports only short, laboratory-monitored evaluation—not a proven lifestyle or medical-therapy substitute. (Full Review)
| Marker | Target | Why |
|---|---|---|
| Total testosterone | ~500–900 ng/dL (lab-specific) | Primary efficacy endpoint |
| Free testosterone | Upper half of lab reference | Bioavailable testosterone signal |
| SHBG | Mid lab range | Interprets free fraction |
| Estradiol (sensitive) | Roughly 20–40 pg/mL (individualize) | Testosterone-to-estrogen balance |
| LH | Low–mid reference if primary testicular failure absent | Confirms pituitary drive if testosterone rises |
| FSH | Lab reference | Sperm-production axis context |
| ALT | Often <30 U/L functional | Liver-cell injury screen |
| AST | Often <30 U/L functional | Liver-cell injury screen |
| GGT | Low–mid reference; preference toward lower | Bile-flow, alcohol, or other liver-stress signals |
| ALP | Lab reference | Bile-duct or bone enzyme forms |
| Total bilirubin | Lab reference | Liver clearance function |
| Creatinine / eGFR | eGFR ≥90 mL/min/1.73 m² preferred | Kidney filtration safety |
| Fasting lipid panel | TG <100–150 mg/dL; HDL adequate; LDL individualized | Animal data worsened lipids |
| CBC (hematocrit) | Hematocrit typically <50–52% | Androgen-related excess red-blood-cell mass screen |
Cadence: Baseline before first dose; repeat at 2–4 weeks, near 8 weeks if continued, then every 3 months during extended use—or sooner if symptoms arise