This product contains an ideal blend of essential vitamins A, D, and E, which play vital roles in: Vitamin A: Essential for maintaining healthy mucous membranes in the respiratory tract and larynx, supporting proper vocal performance and reducing the risk of vocal problems. Vitamin D: Enhances the absorption of calcium and phosphorus, two minerals important for bone and muscle health, including the muscles responsible for voice production. Vitamin E: A powerful antioxidant that protects cells from damage and supports the overall health of the nervous and muscular systems, positively impacting the strength and clarity of a bird's voice.