Dietary Supplement. 20% Free. Ferrous Sulfate 325 mg Essential Mineral Helps Production of Red Cells & Specific Enzymes*. 21st Century®...for a healthier future Each tablet contains 200 mg Dried Ferrous Sulfate equivalent to 325 mg Ferrous Sulfate Heptahydrate. Iron is an essential mineral and is important for the production of red blood cells and specific enzymes.* Laboratory Tested No sugar, salt, yeast, preservatives, or artificial flavors.