WHAT IS VALINE?
VALINE IS AN ESSENTIAL BRANCHED-CHAIN AMINO ACID
Valine is one of three Essential Amino Acids (EAA) that are considered Branched-chain Amino Acids (BCAA). Valine, like the other BCAAs, promotes Muscle Growth and Muscular Recover. According to PubMed, Valine can also be used to treat metabolic and liver diseases in clinical settings. 
Leucine, like all BCAAs, are different from the other EAAs because they are metabolized in your muscles and not your liver, like the other EAAs.