Most anabolic steroids, especially the androgens, cause inhibition of the body's own testosterone production. When a bodybuilder comes off a steroid cycle, natural testosterone production is zero and the levels of the steroids taken in the blood are diminishing. This leaves the ratios of catabolic : anabolic hormones in the blood high, hence the body is in a state of catabolism, and, as a result, much of the muscle tissue that was gained on the cycle is now going to be lost. This is why we need PCT to gain muscle as needed.
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