Mineral supplementation is generally in the form of oxides, sulfates, and chlorides termed inorganic minerals, which generally have lower bioavailability than organic minerals. A recent study evaluated the use of organic versus inorganic minerals in a diet for stressed calves. The overall morbidity was 52% with heifers fed the organic mineral at 46% compared with 58% for the inorganic mineral. Additionally, heifers fed the organic mineral gained 1.72 lb/d compared with 1.54 lb/d for the inorganic mineral. This level of improvement in health and performance is not always evident in research studies comparing organic and inorganic mineral sources.