A standardized extract of the tropical plant Tribulus terrestris, also known as "puncture vine." This herb enjoys an illustrious history in folklore medicine for sexual deficiency. Volumes of clinical research have been conducted at the Chemical Pharmaceutical Research Institute in Sofia, Bulgaria. Supplementation in both men and women demonstrated differing effects upon various hormonal parameters.* The changes in men showed significant increases in luteinizing hormone (LH), testosterone (T) and estradiol (E).* Women observed increases in follicle stimulating hormone (FSH) and E while T and LH increased only slightly.* The investigation was performed to measure the increase in libido, sperm production and motility but increases in T have long been associated with increases in lean body mass.
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