DL-Phenylalanine (DLPA) is an essential amino acid, meaning the body produces it naturally from the diet. All proteins in the body are made from amino acids, which is why amino acids are often referred to as the "building blocks" of proteins. Phenylalanine is one of the eight amino acids indispensable in the diet of man. It comes in two forms, called "D" (right-handed) and "L." L (left-handed), Phenylalanine is also found in a mixture consisting of equal parts of the D and L forms, referred to as DL-Phenylalanine (DLPA).

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