5 weeks in on a Test P, Mast P, NPP cycles and got into a third bottle of the NPP, and all of a sudden bad pips and heartburn. The source is no more, but if you know me you know what I had been using. I'm guessing the concentration on this bottle is higher than the others, so I figure I'll cut the dose in half. I've been pinning everything together and still.....Never had pip before.