Pure Turkey Tail, also known as Coriolus.

Aloha  Pure Turkey Tail™ is used in the production of PSK and PSP. Pure Turkey Tail™ contains approximately 25% of PSK and PSP.

PSK is a protein polysaccharide consisting of a beta-glucan β-1,4 main chain with β-1,3 and β-1,6 side chains. The approximate molecular weight of PSK is 100,000 Da, and the protein component is reported at the β-1,6 side chain.[5] PSK is isolated from the "CM-101" strain of Trametes versicolor. The analogous compound PSP, is derived from the "COV-1" strain of Trametes versicolor.[6]