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Originally Posted by
MuscleInk
No. An exogenous (outside the body) steroid will create a negative feedback loop such that your HTPA will down regulate your own testosterone and suppress production. Your PCT is part of the process to restart your own natural testosterone.
Keeping gains depends on part, your neuroendocrine system restarting, but more importantly it depends on maintaining the caloric intake that produced the gains during your cycle. You don't keep up that caloric intake, you WILL lose gains.