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Considered the principal male sex hormone, testosterone is responsible for stimulating and controlling characteristics that are considered "masculine," like muscles and hair growth. What many people don't realize is that this hormone is present to a lesser degree in females. What's more, low testosterone levels can cause countless health problems for both sexes, including memory loss, anxiety and depression, osteoporosis, increased cholesterol levels, weight gain, sexual dysfunction, and infertility. while testosterone supplements are available, most are ineffective and some are even dangerous. In the updated edition of Testosterone Is Your Friend, author Roger Mason presents the latest and most effective natural treatments and supplements to help raise testosterone levels.