I've been using Superior Peptides mk 677 for a little over three weeks now and am very impressed. It took me a good week at least to get used to it, that is the hunger and tiredness. I backed off the dose of 1 ml to .75ml and everything is good now, although I might go back to 25mg now that I know what to expect. I was crazy hungry the first week, literally couldn't stop eating. So it might be better to use during a bulk, for me anyway. I found it best to take before bed as it puts me in a nice sleep. Pumps are real nice, and strength is up as well. My muscles definitely look and feel much fuller, although I'm holding more water, which was to be expected. I've been using it with lgd 4033 and Cardarine and have had great results.