If your running an anabolic with luck you'll not lose any on the arms. Stuff is a great base to anything. I love it. I'm thinning down myself, with diet exercise and running 4-Andro/Epi-Andro I can't be sure what's doing the magic here but I feel like the appetite, rates of recovery. And sleep bonus are all contributing factors. Ive lost one waist size already and gained on the arms.Never had the lethargy or bloat from MK. Am on a cut at the moment. It's been very effective at maintaining strength levels thus far. Lost 1.5" from the waist in a couple weeks on a 500 calorie (approx) deficit (waist down to 34.5") My measurements (arms,chest,legs) have not decreased. We'll see what happens when another couple inches come off the waist though.