Check out the sticky up top called pct... pct... pct. Lot of good info up there. From what I understand you should stop when you start you pct which would be a couple weeks after your last shot since those both have long half lives like teo weeks I believe. Anyway there is a guy named drjmw (i think) who really seems to have it down check it out with him he seems to be answering ?'s on that sticky...good luck!