Turkey Tail (Trametes versicolor) is one of the most common and most researched medicinal mushrooms in the world, found on dead and dying trees across forests on every continent except Antarctica. Its distinctive fan-shaped, multicolored bands resemble the tail feathers of a wild turkey. Turkey Tail holds the distinction of being the only medicinal mushroom with an FDA-approved clinical trial for cancer support (PSK/Krestin, approved in Japan since 1977). It is one of the most convincingly evidence-backed functional mushrooms for immune system support and gut microbiome restoration.