The studies suggest that T levels decline at a more or less constant rate, with age, in men, with no period of accelerated decline. However, no quantitative evaluation of the testosterone and aging amd longitudinal influence of aging on the incidence of hypogonadism has yet been reported. Benefits of using testosterone pills include easy administration, quick result, and painlessness. Most pills are made from 100% natural supplement and are safe to use. A lot of pills available now are products containing herbs. A testosterone deficiency (TD), also known as male hypogonadism, refers to the lack of testosterone, a male hormone responsible for sexual ability, male characteristics and normal brain function.