Boron

Boron may temporarily lower SHBG; the discussed supplement dose is 3–6 mg once or twice daily.

• Natural sources: Boron occurs in soil, with richer soils noted in parts of the Mediterranean, including Greece and Turkey. Dates and raisins grown there may provide boron. 1
• SHBG effect: Boron may help regulate SHBG and lower it, but the effect is described as mostly acute rather than sustained. 2
• Huberman’s intake: Huberman reported taking 2–4 mg per day and said his blood work was where he wanted it. 3