I find Leucine to be extremely anabolic. I feel a huge difference training with BCAAs compared to training without
As we all know carbs are anabolic.
That being said, I believe I successfully figured out a solution on how to build muscle mass while on a deficit while I was doing my bodybuilding prep. I will however have to experiment further as I only went about a month into that part of the program before I hit the wall of overtraining (due to under eating, and not overtraining Ironically).