Shiitake has been used for centuries in Asia. It is very rich in Vitamin D. Shiitake has three compounds which lower cholesterol, Eritadenine, Sterols, and Beta Glucans, each which combat it in different ways. Shiitake has also been effective to boost the immune system, is known to be an anti-bacterial, ant-viral, anti-fungal in the human body. Best known as a culinary mushroom, it has a nutty flavor and unique texture.