As I understand it, the receptors that pick up the signals to produce more testosterone need to be refreshed from time to time. The cycling gives them a break and allows your body to become more receptive to the Testosterol and not build up a tolerence. Having said that, I know of two very big guys here in Florida that I know for a fact, take Testosterol and do not cycle it. But they also take larger than recommended dosages.
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