Shiitake mushrooms are a good source of key vitamins and minerals including: Vitamin D, Copper, Selenium, Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Potassium, Manganese, Magnesium, Iron, Phosphorus. Shiitake is known to lower blood cholestorol levels + support a healthy immune system. Local, Certified Organic.