Testosterone is responsible for several important things like muscle and hair growth, development of reproductive tissue, and increased muscle mass. As men in Castle-Pines age, their levels of this hormone decrease, and that loss can be accompanied by a loss of libido, low energy, bone loss, and infertility. The doctors at Cratos Health Calculated in Castle-Pines can supply testosterone boosters like TestoStim to greatly help maintain healthy amounts in the later adult years.