Many studies have shown that testosterone levels begin to decline by about 1% per year after the age of 30. Low Testosterone levels can lead to: lack of energy, decrease in muscle, fatigue, bad mood, irritability, an increase in body fat, weak erections, low libido, poor sleep, decreased urge to exercise and more. Start treating these symptoms as soon as possible. First, with a diagnosis from a LowT99 doctor find out once and for all if you do, in fact, suffer from low testosterone. If that is the case, let LowT99 doctors get you on a personalized testosterone therapy immediately and start turning things around.