Equine Athlete Chromium contains organic chromium, amino acids important to muscle performance and repair and Vitamin B6. Human athletes have known about the role of Chromium as an essential nutrient for years. However, it is only since 1992 that equine researchers have clearly defined Chromium’s role in improving performance. Kentucky researchers have shown that horses fed 5mg of organic Chromium per day had significantly lower blood lactate and blood cortisol levels after intense exercise.