I do not know about stimulating a hormone for muscle, but it does add a smooth layer of cover over the ribs, helps the hair and skin, and is not hot like corn so will not affect trying to grow hair. We fed it to the steers and had great success with the it. We fed it early to calves who need to catch up, as well as to steers we needed to hold, kept them from going stale.
Helps keep calves looking fresh.
The guy that got me started on it said that one of the places he had worked at fed it to their whole string of Angus show heifers every year, and had great results.