Royal Canin Veterinary Diet Calm Dry Dog Food 8.8 lb A peptide from milk Alpha-casozepine this molecule has proven to have a number of behavioral changes in dogs similar to Selegiline L-tryptophan an amino acid that creates a sense of well-being in dogs. Nicotinamide Contains Vitamin B3 which gives realxing and anti-anxiety effects to the central nervous system. creating a calming effect. Skin Function from amino acids and vitamins Supports Digestive Function from proteins and chicory and beef pulp are a great source of fiber