From a quick look around the internet, there doesn't seem to be many. Its something bodybuilders have been looking for because it inhibits Myostatin which caps muscle growth. That is mentioned in the study. The product linked first in the thread, Myo-X and Epicatechin look the most promising. Myo-X does have 2250 iu's of Vitamin A, though, so I don't know if that's a problem.