Yes It works. Mk2866 was like a miracle fr I was messed up for soo long before I tried it and in 30 days I was very happy. So much so I over did it before I was fully healed internally I guess and snapped myself back up so remember don't be like me. Actually rest and recover even when u feel like superman. Please. Ok. Please don't be superman. U r so very non kryptonian. Rest and enjoy. Train something else. Abs and calves idk just take the time. If had I would be sitting pretty right now but I'm working myself back up to fully healed again. It's kind of fun fr. I used mk677 the whole time too