Supplementing with boron may boost free testosterone by lowering sex hormone-binding globulin (SHBG) SHBG is a protein that binds testosterone, preventing it from being immediately available to your body While boron won’t increase total testosterone production, doses around 6 to 12 mg daily may help free up more testosterone by modestly reducing SHBG levels Not that current research is sparse and weak—boron supplementation is best viewed as an additional measure rather than a primary testosteron