Androgens are responsible for the growth spurt of adolescence and the aromatization of androgens to estrogens for the eventual termination of linear growth, which is brought about by fusion of the epiphyseal growth centers. In children, exogenous androgens accelerate linear growth rates but may cause a disproportionate advancement in bone maturation. Use over long periods may result in fusion of the epiphyseal growth centers and termination of the growth process. Androgens have been reported to stimulate the production of red blood cells by enhancing the production of erythropoietin stimulating factor.
After a cycle, mainly due to the high aromatization and increased levels of estradiol in the blood after discontinuing, natural testosterone levels will be severely suppressed. This means steps need to be taken to assure the quick return of natural testosterone, or we stand to lose a lot of the gains we made while using testosterone. Since it's a non-toxic, potent mass-builder its mostly used in long 10-12 week cycles. So some testicular shrinkage will have occurred too. Its very important that people see that HCG and Nolvadex/clomid are essential as a post-cycle therapy, and that both are equally important in achieving our goal. HCG injections should be started the last week of the cycle and continued for 3-4 weeks, using 1500-3000 IU every 5-6 days. HCG will act as an alternative to LH and start the endogenous testosterone cycle, thereby increasing testicle size once again. Then about 2 weeks after the last shot of testosterone is given, Nolvadex/Clomid cycle should be started. 40 mg of Nolva or 150 mg of Clomid per day for two weeks, followed by two more weeks with either 20 mg of Nolva or 100 mg of Clomid per day should be adequate. Always remember that HCG is suppressive of natural testosterone itself and should be discontinued at least 2 weeks prior to finishing Nolvadex/Clomid