Out of all of these, creatine is the closest thing to what OP was describing, but even then it doesn't affect lean mass, it just draws water into muscles and increased endurance.

L-Argenine is huge for me in competitive cycling. Among many effects, it allows more oxygen to get to my muscles, which can double my range and substantially increase my speed. Fish oil is another big one, before for join mobility, during for comfort, and after for re-uptake of quick fats. So far the only drawback is burps that have a funny taste from the fish oil.