Tyrosine
Tyrosine : Nonessential amino acid but may be essential for individuals with certain diseases or nutritional concerns. May be important for neurotransmitter synthesis and mood regulation. May be useful for depression, allergies and addictive states. Tyrosine transmits nerve impulses to the brain; helps overcome depression; improves memory; increases mental alertness; and promotes the healthy functioning of the adrenal thyroid, and pituitary glands