DL Phenylalanine is a combination of L phenylalanine (an essential amino acid) and D phenylalanine. L phenylalanine is converted by the body into another amino acid, L Tyrosine which is responsible for the creation of certain proteins, thyroid hormones and brain chemicals including dopamine, epinephrine & nore-pinephrine. D phenylalanine is thought to inhibit metabolic enzymes, such as Carboxypeptidase A, from preventing endorphin production.
DL Phenylalanine 250 mg
1 to 4 capsules per day on an empty stomach.