Prengyl by Organon. 1,500 to 20,000 IU (International Units) per 10 cc vials. HCG is not a steroid but it is widely used in athletics today. HCG Prengyl is a natural protein hormone secreted by the human placenta and purified form the urine of pregnant women. This hormone is not a natural male hormone but mimics the natural hormone LH (Luetinising Hormone) almost identically. This LH stimulates the production of testosterone by the testis in males. Thus HCG sends the same message and results in increased testosterone production by the testis due to its effect on the leydig cells of the testis.
While HCG offers the female no performance enhancing ability, it does prove very useful to the male steroid user. The obvious use of course being to stimulate the production of endogenous testosterone. The activity of HCG in the male body is due to its ability to mimic LH (luteinizing hormone), a pituitary hormone that stimulates the Leydig's cells in the testes to manufacture testosterone. Restoring endogenous testosterone production is a special concern at the end of each steroid cycle, a time when a subnormal androgen level (due to steroid induced suppression) could be very costly. The main concern is the action of cortisol, which in many ways is balanced out by the effect of androgens. Cortisol sends the opposite message to the muscles than testosterone, or to breakdown protein in the cell. Left unchecked (by an extremely low testosterone level) in the body, cortisol can quickly strip much of your new muscle mass away.