Check the listing for details. Muscle Matrix Protein, Dutch Chocolate, 2 lb (907 g). Condition: New. Listed at 51.99 USD. Provides Up to 4 Hours Sustained Release Protein 55% Fast Release Whey Protein Isolate 45% Slow Release Micellar Casein Natural Flavoring Protein Supplement 25 g Protein 5.2 g BCAAs Kosher Dairy Gluten Free Non-GMO BSE / TSE Free Since 1996 Spike Free - No Amino Spiking Full Label Disclosure No Proprietary Blends Every Ingredient Disclosed With Dosage Each serving of Muscle Matrix contains 25 grams of pure, complete protein derived solely from 55% fast digesting Whey Protein Isolate and 45% slow digesting Micellar Casein. This precise combination of proteins promotes positive nitrogen balance and elevates muscle protein synthesis for up to 4 continuous hours providing the perfect anabolic state for maximizing muscle growth and repair.