A good PCT will help, correct. Also, it's important to continue to eat to support the new muscle. Your body will want to shed muscle as quickly as it can in order to be as efficient as possible, so you must eat enough to give your body every reason to hold on to your new muscle gains. How much you keep will depend on how strict you are with your nutrition. It will also depend on how big you are. For a new guy that started training at 150 lbs, got to 170 natural, then hit 190 on his first cycle, he will be able to hold a lot more of his new muscle than the same guy at 250 lbs. Follow me? The bigger you get, the harder it is to hold naturally, and the more food it takes to stay at the heavier weight. Also, it depends on how quickly you recover your natural test. 

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