Nutrience Care Dog Calm & Comfort is formulated with moderate amounts of protein, including easy-to-digest whey protein and hydrolyzed casein to reduce overall body stimulation. L-tryptophan: an amino acid required for serotonin production (important in regulating mood, social behavior, digestion, ect.) and L-tyrosine: an amino acid required to make dopamine (a neurotransmitter associated with reward-motivated behavior and motor control). All Nutrience Care formulas fetaure Digestiboost - a cold formed, air-dried digestive aid, rich in soluble, insoluble & prebiotic fibers, organic acids, and gut-soothing ingredients, including, but not limited to pumpkin, chia, flax & ginger. Calm & Comfort Formula Key Features : •Formulated with easy-to-digest whey protein and hydrolyzed casein to reduce overall body stimulation •L-tryptophan: an amino acid required for serotonin production •L-tyrosine- an amino acid required to make dopamine