Boron is a cheap trace mineral that may raise usable testosterone indirectly — by loosening the blood protein that keeps testosterone inactive, leaving more in its active form, while nudging estrogen down in men and easing inflammation. Human evidence is thin: small, short studies, promising but unsettled. Generally safe at studied amounts; not a substitute for sleep and training. (Full Review)
| Marker | Target | Why |
|---|---|---|
| Total Testosterone | ~600–900 ng/dL (men) | Overall androgen production |
| Free Testosterone | ~15–25 pg/mL or ~2–3% of total (men) | The bioactive fraction boron targets |
| SHBG | ~20–40 nmol/L | The carrier protein boron is thought to lower |
| Estradiol (E2) | ~20–30 pg/mL (men) | Detects unwanted estrogen shifts |
| 25-Hydroxyvitamin D | ~40–60 ng/mL | Boron extends vitamin D activity; vitamin D supports testosterone |
| hs-CRP | <1.0 mg/L | Tracks the inflammation boron may lower |
Cadence: Baseline before starting, then ~6–8 weeks after starting, then every 6–12 months (sooner if using doses above 6 mg/day)