Douglas Laboratories Klean Iron Support Muscle Strength and Athletic Performance Klean Iron supplies 27 mg of iron from iron carbonyl to help support optimal iron levels, which in turn affect athletic performance and muscle strength. Iron carbonyl (Ferronyl®) has excellent bioavailability, low toxicity and is well-tolerated.Klean Iron is tested and certified by the NSF Certified for Sport® Program, which was created to meet the growing demands of athletes, coaches and healthcare professionals to certify that sports supplements are safe and completely free from banned substances. Every product that carries the NSF® mark has undergone stringent laboratory testing to confirm content, purity and compliance. Key Benefits and Features: Essential for red blood cell formation Support for athletic performance Support for muscle strength Ingredients Serving Size: 1 Tablet Amount/Serving Iron (as Ferronyl®, iron carbonyl) 27 mg Other Ingredients: Microcrystalline cellulose, ethylcellulose, stearic acid, vegetable stearate, silica, and coating (hypromellose, glycerin). Gluten Free, GMO Free, Vegan, Vegetarian, NSF Certified Sport Suggested Use As a dietary supplement, adults take 1 tablet daily without food or as directed by a coach, trainer, or health professional. Warning: If you are pregnant, nursing, have any health condition, or are taking any medication, consult your health professional before using this product. If gastrointestinal symptoms occur, take with food. Use only if safety seal is intact. Keep this product out of reach of children. Accidental overdose of iron-containing products is a leading cause of fatal poisoning in children under 6. In case of accidental overdose, call a doctor or poison control center immediately. Storage: Store in a cool, dry place. More Info. Iron is an important component of hemoglobin in red blood cells and myoglobin in muscle cells, where it is required for oxygen and carbon dioxide transport. Optimal iron levels of at least 20-25 ng/mL have been associated with athletic performance, muscle strength, and mitochondrial function. In a clinical trial involving iron-depleted (serum ferritin