Beef Liver is considered by some to be a superfood since it is high in many different vitamins, nutrients and minerals. It contains Vitamin A, B, C, D, E, K, Omega 3s, Choline, Biotin, Calcium, Chromium, Copper, Iron, Magnesium, Manganese, Molybdenum, Phosphorus, Potassium, Selenium, and Zinc Double Wood Supplement's Beef Liver Supplement contains 1,000mg of Grass Fed Beef Liver per serving (500mg per capsules). Each bottles contains a 90 day supply (90 servings, and 180 capsules). The product is manufactured in the USA, Non-GMO, and Gluten Free