should i be taking dhea with these 2? and if so why?

I dont see why you have to......
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I think DHEA is unnecessary.
Why do you have to take DHEA?
What is your goal?
Its being used for cortisol blocking PCT. It can potent to knock out the cortisol response. There's key types. I forget them.
It does block cortisol but PP use it as a prohormone along with preg. You need something to keep cortisol in check, endomax (PAS), VAT attack, Rhodiola + other herbs, Lean FX that sort of thing.
Both do, one stronger than the other.