6. Concurrent use of testosterone and or any hormonal therapy, including health food supplements and herbal products, that could alter serum testosterone levels or affect the prostate (e.g. gonadotropic releasing hormone agonists, testosterone antagonists, anabolic steroids, DHEA, androstenedione, PC-SPES, chrysin and tribulus terrestris,). Use of alpha-reductase inhibitors or prostate phytotherapy within the past 3 months.