Nutraviva Organic Beef Liver Capsules are a highly bioavailable, rich source of heme iron in an easy-to-take form. Beef Liver is a nutrient-dense wholefood supplement regarded as 'nature's multivitamin' and is a rich, natural source of vitamins and minerals including iron, vitamins C, B9 (folic acid), A (retinol), B2, B4, B5, D3 and copper.