1. Cancer when used with chemotherapy. Taking polysaccharide krestin (PSK), a substance found in coriolus mushroom, by mouth may improve some the response to chemotherapy in people with various cancers. PSK has been used in Japan for several decades for breast cancer, esophageal cancer, gastric cancer, lung cancer, hepatic cancer, colorectal cancer, and nasopharyngeal cancer. Results have varied.
2.Chronic fatigue syndrome.
7.Skin infections, including impetigo.
8.Urinary tract infections.
9.Digestive tract infections.