“Testosterone SupportBoosts Free Testosterone in 7 Days!^Enhances Muscle Strength†Dietary SupplementLab Tested – Every LotcGMP Registered FacilityNo Proprietary BlendsContains bovine-derived ingredientsBoosts free testosterone & reduces estrogen in 7 days!^28% Increase Free Testosterone. 39% Decrease Estrogen.TESTOFX SPORT contains elemental Boron which is a micronutrient shown in a clinical study to increase free-testosterone levels by 28% while reducing estradiol by 39% in just 7 days.^^Naghii et al. Journal of Trace Elements in Medicine and Biology. 2011