Low Testosterone Side Effects The natural function of aging is why men experience a decrease of testosterone levels. There are over thirteen million men with low levels of testosterone. Past the age of thirty there is an annual one percent dip in the level of testosterone according to the American Diabetes Association (ADA) . What does the decrease of this hormone mean? What are the side effects or symptoms that go with the loss of this male hormone? There are a number of important bodily functions that testosterone helps men to maintain, including: Bone density Distribution of fat Strength/muscle mass Production of sperm Sex drive Production of red blood cells There can be significant emotional and physical changes as a result of the testosterone decrease because it affects so many functions. Sexual Function The possibility of sexual desire and performance being affected is one of the largest worries faced by men when the levels of testosterones start to decrease. When men age, ...