EnduraPet Immune Support 4 Pack Designed to boost your pet's immune system, potentially slowing the spread of terminal disease and helping keep your pets alert and enthusiastic about eating, walking, and snuggling with you for a longer period of time Veterinarian approved and recommended Manufactured in an FDA approved facility which complies with Good Manufacturing Practices (GMPs). Provides important cardioprotective support for pets undergoing treatment. Can improve heart function and strengthen the heart muscle to improve circulation Nine meticulously chosen, carefully sourced, natural immune-boosting ingredients including CO-Q10, L-Lysine , Maitake mushroom, OPCs , Green tea extract and Vitamin E succinate.