Just got them and only used for a few days but reps went up for sure by like 50% it works and It works fast. I am on 100mg of test cyp per week on top of this. Only down side was it was hard to sleep. I am going to get cycle support before I do a full blown cycle. You can 'feel';the harshness. But of course how you feel is relative to your biochemistry. If you are going to use these be smart about it. Protect your body. They're stronger than I expected.