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DL-Phenylalanine is one of the essential amino acids that cannot be produced by your body, and thus it must come from your diet or from DL-phenylalanine supplements. This amino acid serves as a building block for the various proteins that are produced in your body, and it is a precursor to important neurotransmitters found in your brain that help regulate mood and other mental functions. Want to know more about how DL-phenylalanine supplements work? Check out the customer reviews.