I've just finished a 4 week supply of Clear Muscle. This product is one of those things that you can't feel working, but the results definitely speak for themselves. After the second week I started noticing a definite difference in my physique - my arms, chest, and back became much more defined. After the third week, my friends and family started commenting on the difference. In terms of gains, I netted 4.4 pounds in the 4 weeks, from 185.2 to 189.6 (just shy of the 1.36 pound per week clinical trial. I did NOT follow the full workout program, choosing to keep my workout the same so I had a better comparison.) I didn't have any side affects, and my only complaint is that taking pills 3 times a day when you're constantly on the go is a slight annoyance (I set reminders in my phone's calendar so I wouldn't forget!) I would definitely get more of this product to continue using, and recommend it to anyone whose goal is adding muscle.