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Free Form Amino Acids play wide-ranging roles and are crucial if the body is to function at an optimal level. First and foremost, their job is the synthesis of proteins. There are 20 “standard” amino acids used by cells in protein biosynthesis. Nine are “essential” and must be obtained via diet since the body cannot produce them. “Nonessential” amino acids, on the other hand, are produced in the body from other amino acids when given adequate supplies of nitrogen, carbon, hydrogen and oxygen.