Host Defense Turkey Tail Extract supports immune response, Gi health, digestive health, and gut microbiome balance with mushroom mycelium. Turkey Tail is one of the most studied mushroom species and is known for supporting immune cells and an engaged immune response. This prebiotic herbal supplement also supports probiotic microflora in the gut for digestive health. For microbiome and immune support, take 1 full dropper twice daily with food or on an empty stomach, or as recommended by your healthcare advisor. Powered by mushroom mycelium, Host Defense products contain no fillers and are third party tested for quality and safety. Made by Fungi Perfecti, founded in 1980 by Paul Stamets, with certified mushroom mycelium and fruit bodies grown in Washington State.