This immune-boosting supplement, which is safe for both dogs and cats, enhances liver and kidney function for optimal health. It contains a proprietary blend of turkey tail, maitake, cordyceps, lion’s mane, reishi, shiitake, and sun mushrooms to help your pet fend off illnesses.

From the brand:

NOW® Pets Immune Support is designed to help support your pet's immune system and innate resistance to pathogens, as well as help to enhance liver and kidney function. NOW® Pets Immune Support is made with natural botanicals and has been formulated by renowned veterinarian Dr. Barbara Royal, DVM, CVA, founder of the Royal Treatment Veterinary Center.