Optimum Nutrition Gold Standard Casein: The Ultimate Slow-Release Protein Optimum Nutrition Gold Standard Casein offers a unique approach to protein supplementation, providing a slow and sustained release of amino acids to support muscle recovery and growth. While fast-digesting proteins like whey are ideal for post-workout consumption, casein’s delayed digestion makes it perfect for maintaining an anabolic environment throughout the day and especially during periods of fasting, such as overnight.
