A clinically proven mood enhancer, DL-phenylalaline is a precursor of the amino acid tyrosine. The scientific literature reports that supplementation with DL-phenylalanine enhances mood & well-being, probably by increasing endorphine & enkephalin leve A woman who is pregnant or nursing, or who might become pregnant, should consult a health-care practitioner before using this product. SPECIAL NOTE: DL-phenylalanine is not recommended for use in conjunction with prescription anti-depressants.2 -3 capsules bid