Well, we have all taken "amino acid" suplements; if you have ever drank a protein shake that is exactly what you are doing. Amino acids are the building blocks of protein. Most protein supplements out there have a fairly good amino acid profile. There are essential amino acids which our body needs for regular body processes which definitely includes repairing and building of muscle. You can find a good potein blend out there containing casein and whey which all have a high BV(biological value). The amino acid profile is on the packaging of the protein, which the more essential amino acids present the better. There is no need to waste your money on Amino Acid pills because its only a gimmic. Buy a good protein and you're set with a good profile of amino acids.