Gold Standard 100 % Casein from Optimum Nutrition is a micellar casein protein supplement formulated for slow amino acid release. Specifically designed to protect muscle mass during sleep, this product offers 1.8 kg of high-quality protein. Unlike other proteins, casein thickens in the stomach, creating a gel that slows digestion and provides a continuous supply of amino acids for up to 8 hours, preventing muscle breakdown during prolonged periods without food. Each serving includes 24 grams of protein, along with calcium, glutamine, and essential BCAAs, ideal for muscle recovery. Additionally, its dense and filling texture helps control hunger, especially useful for those on weight control diets. This supplement is recommended for bodybuilders, endurance athletes, and anyone in a cutting phase needing to maintain a positive nitrogen balance overnight. Safety and trust are backed by Optimum Nutrition, a leader in sports supplementation, which manufactures this product in the UK.