The finest shiitake, treasured for their spectacular flavor. Grown on oak logs in a natural forest habitat, hand harvested, sliced, and dried. A revered health food. Research indicates shiitake's unique polysaccharides may help to stimulate immune system strength. Rich in vitamin D and fiber, and a good source of niacin B3. Mushrooms are the only vegetable source of vitamin D and only the dried are a rich source.