![Beef Liver (per lb)](http://www.tajfresh.com/cdn/shop/products/Beef_Liver_{width}x.gif?v=1563637259)
A small amount of liver provides well over 100% of the RDI for many essential nutrients. It is also rich in high-quality protein and low in calories. While most animal livers can be eaten, common sources are cow, chicken, duck, lamb and goat. Summary: Liver is possibly the most nutrient-dense food in the world.