Athletes who use pro-hormones are beginning to see that Testosterone is the choice hormone to supplement when older than 21. In the world we live in, we are constantly being invaded by Exeno-Estrogens. Everything from BPA in our soda, to other chemicals we eat are producing environmental estrogens in our body. Men must increase their testosterone to even out this imbalance of hormones caused by their diet. Having too much estrogen can lead to medical problems, obesity, and sexual dysfunction. Supplementing a pro-hormone can correction this disrupted ratio of testosterone to estrogen.