The human chorionic gonadotropin. Known as HCG. This is a specific injectable active ingredient, which must then be taken back when treatment with antiestrogens no longer acts. HCG is essentially a prescription agent for increasing fertility, which imitates the body's natural luteninizing hormone. The administration of HCG activates the testicles shockingly by an overwhelmingly high level of luteninization hormone which allows the user to achieve a hormone level that the body can achieve impossible without this intervention or only with the help of the anti-estrogen. Why is that important? Recent studies suggest that normal antiestrogen agents may not be as effective as previously thought. Therefore, the use of HCG as a Plan B should be retained for post cycle therapy in the posterior.