Optimum Nutrition Casein 4lb is a slow-digesting protein supplement designed to provide a sustained release of amino acids to help support muscle recovery and growth overnight or between meals. Each serving delivers micellar casein protein, which digests slowly compared to other protein types, helping to reduce muscle breakdown while you rest. This formula is ideal for anyone looking to maintain a steady supply of protein for extended periods, such as during sleep. It mixes easily and is available in a creamy, smooth texture to complement your preferred beverage.

• 24 g of micellar casein protein per serving: slow-release, sustained amino acid delivery
• Time-release formula: ideal for use before bed or between meals
• Naturally occurring BCAAs & EAAs: supports muscle recovery and growth
• Low in sugar & fat: helps maintain macronutrient balance
• Creamy texture & satisfying consistency: makes for an indulgent shake
• Available in multiple flavors: e.g. Chocolate Supreme, Creamy Vanilla, Cookies & Cream, Chocolate Peanut Butter
• Mixes easily with water, milk, or into smoothies
• Supports “anti‑catabolic” needs: helps prevent muscle breakdown during overnight fasting

Brands may change ingredients, serving sizes, allergens, or other formulation aspects at any time. Always refer to your product label for the most up to date information.