Boron
Boron is a trace mineral, usually taken as boron citrate, glycinate or calcium fructoborate, that has a small but real effect on sex-hormone chemistry. Short human studies show it can lower sex-hormone-binding globulin and raise free testosterone and free estradiol, while also reducing inflammatory markers. Effects are modest, and it is a supporting mineral rather than a standalone testosterone drug.
01 Overview
Supplemental boron reduces SHBG, which raises the free fraction of testosterone even when total testosterone changes little, and it also increases free estradiol and lowers inflammatory markers such as hs-CRP and IL-6 in short studies. It appears to influence vitamin D and magnesium status as well, which may contribute to its hormonal effects.
Users take low daily doses as a cheap adjunct to nudge free testosterone and reduce inflammation. It is well tolerated at supplement doses; toxicity only becomes a concern at far higher intakes, where GI upset and, at extreme levels, reproductive toxicity are reported. Because it raises free estradiol as well as free testosterone, it is not a pure androgen lever.
02 Mechanism
Trace mineral that lowers sex-hormone-binding globulin (raising free testosterone and free estradiol), reduces inflammatory cytokines and interacts with vitamin D and magnesium metabolism.
03 Dosing
| Tier | Dose | Route | Notes |
|---|---|---|---|
| Standard supplement dose | 3–6 mg/day | Oral | Elemental boron; the range used in most SHBG/testosterone studies. |
| Short high-dose studies | 6–10 mg/day | Oral | Upper study range; keep below the tolerable upper intake of ~20 mg/day. |
04 Effects
| Effect | Magnitude | Evidence | |
|---|---|---|---|
| Lowered SHBG / higher free testosteroneShort human studies show reduced SHBG and increased free testosterone within a week or two. | modest | Clinical | |
| Reduced inflammatory markersDecreases in hs-CRP, TNF-alpha and IL-6 reported in supplementation studies. | modest | Clinical | |
| Increased free estradiolFree estradiol also rises, so the effect is not a selective androgen boost. | modest | Clinical |
05 Side effects
| Effect | Severity | Frequency | Evidence | Countermeasures |
|---|---|---|---|---|
| Gastrointestinal upset at high dosesNausea, vomiting or diarrhoea at intakes well above supplement doses. | Mild | Dose-dependent | Observational | |
| Reproductive toxicity at extreme intakeAnimal studies show testicular and fertility toxicity at very high boron intakes far above supplement levels. | Severe | High-intake only | Preclinical |