Dietary supplement. Support metabolism and mental well-being. Is a non-essential amino acid synthesized in the body from the essential amino acid phenylalanine. L-Tyrosine is the direct precursor to several important neurotransmitter, which affect many functions in the brain, including mood, stress response, mental function, satiety and sex drive. L-Tyrosine is also an important component of hormones that are produced by the thyroid. these hormones are in turn key for managing metabolism. L-Tyrosine is required to form melanin, the dark pigment present in the skin to shield the body from the harmful effects of ultraviolet light. (These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure or prevent any disease.) Contains No sugar, starch, artificial colors, flavors, preservatives, corn, gluten, yeast, wheat, grain, egg, or milk product. Potency and purity guaranteed.