During aging, there is a gradual decrease in the ability to maintain skeletal muscle function and mass. This condition is called " sarcopenia ", and may be distinct from atrophy in its pathophysiology. While the exact cause of sarcopenia is unknown, it may be induced by a combination of a gradual failure in the " satellite cells " which help to regenerate skeletal muscle fibers, and a decrease in sensitivity to or the availability of critical secreted growth factors which are necessary to maintain muscle mass and satellite cell survival. 
HCG is a highly beneficial hormone in fertility stimulation and in the treatment of low testosterone. In fact, it is rapidly becoming an integral part of many low testosterone treatment plans. For the anabolic steroid user, the performance enhancing athlete, HCG can be beneficial but it can also be damaging. Many get very carried away with on cycle use and lead themselves to an early low testosterone condition. Granted, most men will benefit from testosterone therapy at some point in their life regardless, but many steroid users end up requiring sooner and often due to improper HCG use. The hormone can be beneficial but use must be kept moderate and monitored.