Does one irritate more than the other? I've used UJ cyp at 200mg/ml and it is truely painless. This stuff hurts for 4 days, and even has a little swelling. I use 3cc's at a time 600mg eth, and 300mg Deca. I have not done them seperately to see if one is more irritating than the other. It's kinda thick, but warm it'll go through a 25g.