L-tyrosine is an amino acid which helps restore dopamine and norepinephrine, two neurotransmitters important for maintaining mood, and which become depleted by stress, including prolonged work or exercise, exposure to cold, and sleep deprivation. Supplementing with Natural Factors L-Tyrosine helps the body manage stress, and improve mood, energy levels, and alertness.Medicinal IngredientsNon-Medicinal IngredientsVegetarian capsule (carbohydrate gum [cellulose], purified water), dibasic calcium phosphate dihydrate, vegetable grade magnesium stearate (lubricant), silica. Ê L-tyrosine is a non-essential amino acid important in the production of neurotransmitters such as dopamine, epinephrine, and norepinephrine Ð required for managing stress. It helps decrease cognitive fatigue due to physically stressful situations and promotes normal and healthy brain function including memory and concentration. It also supports normal muscle movement.