Also known as ‘hen of the woods,’ here is what WebMD says about maitake:
“Maitake mushroom is a fungus that has been eaten as food in Asia for thousands of years. People also use it to make medicine.
Maitake mushroom is used to treat cancer and also to relieve some of the side effects of chemical treatment (chemotherapy) for cancer. It is also used for HIV/AIDS, chronic fatigue syndrome (CFS), hepatitis, hay fever, diabetes, high blood pressure, high cholesterol, weight loss or control, and infertility due to a condition called polycystic ovary syndrome.
Maitake mushroom contains chemicals which might help fight tumors and stimulate the immune system. There is some evidence that it can lower blood pressure, improve cholesterol levels, lower blood sugar levels, and reduce weight in rats, but this has not been shown for humans yet.”