I'm going to go out on a limb here but bear with me. Here's why I believe Meso is natural. I've noticed that people who use ph/aas have very full inner chests as well as very full lower biceps, 2 things that Meso doesn't have (not to take anything away from him as he looks great). Compare Meso to the kid below. At the time the picture was taken the kid had just finished one month of superdrol. His stats: 20 years old, 170 lbs, 5'11" 7 % bf.