Conventional iron supplements rely on ferrous sulfate or other synthetic iron compounds that absorb poorly and cause the constipation and digestive discomfort that makes most people stop taking them. Ironclad delivers heme iron from grass-fed beef spleen, the most bioavailable form of iron available and the one the body absorbs at two to three times the rate of any plant or synthetic source without the side effects. Grass-fed bison heart adds CoQ10 and riboflavin for the mitochondrial energy production and recovery support that heme iron replenishment demands. Two whole-food organs. Clean iron support that actually works.