HCG : It is strongly recommended that HCG be a part of your testosterone cycle. The addition of HCG will prevent testicular atrophy, which will occur with testosterone use. When we use testosterone or any anabolic steroid, we suppress our natural testosterone production. If we are supplementing with testosterone, this isn’t a concern during the cycle as we are providing our body with the testosterone it needs. However, HCG will keep the natural production online, which will make post cycle recovery far more effective. A dose of 250-350mg two times per week will suffice for most men. For information on post cycle therapy (PCT) please visit How to Come off Steroids .
Due to its chemical structure nandrolone is weakly exposed to aromatase (only 20% of the aromatizing activity of testosterone). However, not estrogenic effects are its main concern: nandrolone has a potent progestogenic activity (20% of progesterone). While binding to progestogenic pituitary receptors nandrolone causes increased production of prolactin, which in effect is very similar to estrogen: its effect presents in reducing testosterone production, increasing fat mass and in gynecomastia. To prevent these side effects prolactin inhibitors (cabergoline) shall always be at hand when on nandrolones cycle.