Testosterone levels in men begin dropping in their mid-20s and continue to decline as we age. Aging, stress, obesity, environmental changes, poor nutrition, etc., all have adverse effects on natural testosterone. As T levels drop below suboptimal values, individuals may experience sharp changes resulting in decreased quality of life. Low testosterone levels may contribute to developing conditions such as osteoporosis, diabetes/obesity, cardiovascular disease, hypertension, and increased mortality. Testosterone therapy can help.