Shiitake dried mushroom
From webmd.com :
Shiitake mushroom is a fungus. An extract made from this mushroom is used as medicine.
Shiitake mushroom is used for boosting the immune system, lowering blood cholesterol levels, treating prostate cancer, and as an anti-aging agent.
Shiitake mushroom is also eaten as food.
How does it work?
Shiitake mushroom contains chemicals that might help lower cholesterol levels. It also contains very small amounts of a chemical that seems to keep tumors from getting bigger.