essential amino acids

If you want to gain mass, vary your proteins.
Let's put the marketing aside, and answer two questions: What are amino acids, and why should you be taking them?
What in the world is a cashew apple? Well, it turns out drinking cashew apple juice helps you burn fat. It's chock full of vitamin C, which is needed to form carnitine, which fuels fat burning.
Researchers compared an essential amino acid supplement with the same supplement combined with either carbohydrate or alanine. Turns out all you really need for muscle synthesis is protein.
You've heard the recommendation - eat 1-1.5g of protein per pound of body weight to build muscle. All strength athletes know this. But now, new science says that's too much.