L-Tyrosine is a crucial amino acid for producing neurotransmitters like dopamine, adrenaline, and noradrenaline, and skin pigment melanin. Noradrenaline and adrenaline help the body respond to stress, and together with dopamine, they support a positive mood and mental alertness. Also, L-Tyrosine is vital for normal thyroid gland function. The L-Tyrosine in this product is Pharmaceutical Grade. Natural color variation may occur in this product.