Non-essential amino acids are the naturally occurring amino acids, that the human body can synthesize for itself, and so need not be provided by dietary protein. The body is capable of creating them on its own, therefore it is not necessary for it to attain them from an outside source. They include alanine, asparagine, aspartic acid, cysteine, glutamic acid, glutamine, glycine, proline, serine, and tyrosine.