If you are looking for an iron that is both highly absorbable and gentle on the stomach, Bluebonnet Chelated Iron is a terrific choice. Bluebonnet uses Ferrochel®, a patented, fully reacted chelated ferrous bisglycinate. 18 mg of iron in each serving. Free of milk, egg, fish, crustacean shellfish, tree nuts, peanuts, wheat, soybeans and sesame.