This information isn't new-but before you guys go off the deep end and chuck your advil there are more things to concider. Yes both asprin and advil(acetaminophine and ibuprofen) do to some degree inhibit protein synthesis, but one does it approx. 10x more than the other. And the winner(or loser) is asprin, which is good news in a way. Its not an effective antiinflamitory, and in large doses it can cause stomach bleeding, ulcers, etc. Its only good for pain relief. Advil will also slow down protein sythesis and thus muscle recovery, but to a much lesser degree. At a 1000 mg. its also an effective anti-inflammitory, and it doesn't cause gastro-intestinal bleeding. The anti-inflammitory part is the important one for advil, since once you have muscle/tendon/soft tissue swelling there is going to be very little healing happening until the swelling goes down. That's why anti-inflammitories and ice are the athletes friend. This means that although advil may slightly slow down muscle growth, it can more importantly keep slight strains, pains etc. from flairing up into total workout stopping ones. How many of you guys have been training long term using advil and ice when needed before reading this, and made gains? Like all drugs, there is a proper way to use them, and its easy to abuse them. Asprin is only a pain killer and thus worthless-if you can't deal with the pain of intense training then get out. Injury and strain pain is a different story. you deal with injurys as fast as possible with advil 800-1000 mg once to twice a day and ice 2-3 times a day for 10-20 min. so you can recover and get you ass back in the gym training hard. So basically if your in the habit of just popping asprin or advil cuz it can't hurt-stop. However if you have tendinitis, bursitis, whatever and need advil to keep down swelling so you can train hard, then go for it. I'll look to see if I can find the references on asprin being worse than advil in my free time-I just read that one recently, it's just hard since I'm supposed to be working on my thesis.