Although body builders use HCG to improve athletic performance Human Chorionic Gonadotropin is NOT a steroid. It is a gonadotropin, a substance which stimulates the gonads. These are testis in men and ovaries in women. HCG is a glycoprotein made up of 237 amino acids. Like many hormones it is produced in the pituitary and consists of a beta chain of 115 amino acids and an alpha chain of 89 amino acids that stimulate testicular testosterone production. For this reason it is administered to men to stimulate under production of testosterone. It is also used to induce ovulation and treat ovarian disorders in women. It is also used as a treatment for undescended testicles in young males as well as to prevent testicular atrophy in older men. HCG supports and maintains testicular size and condition. For this reason it is used by bodybuilders who have been on a course of steroids known to shrink testicles. Any male who has been using testosterone patches and gels knows all about that. It also supports sertoli cells which are necessary for nourishing maturing sperm cells. The average cycle of HCG should be in the 2 to 3 week range with a least one month off in between. You could stretch your cycle out to four weeks without any major concern as it is homeopathic and a lower dose.