i dont know how well this will answer your question but from what i know, pp has much more androgenic properties than sd. so as long as im not prone to hairloss or anything like that, i will feel the positive effects from the androgenic characteristics that sd cannot provide. also i have read that sd the 2nd time around isnt as effective. and there have been a few other guys on this forum that have stacked the 2 and had good results.
hope this helps. what orals have you used?
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