Well as I understand it certain substances need an AI like aromasin and others don't, so would depend on the substance you run. Also if you are more susceptible you may want to continue the AI into the pct if you don't then don't.
I would just keep extra on hand. If you don't use it, use it for your next cycle. I do like to run it through the first week of PCT and then after that, if needed.
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