Higher Quality Ingredients = Better Performance. The premium quality ingredients in GU Recovery Brew help you quickly replenish energy stores and rebuild muscles after an intense workout. You’ll notice a difference when you compare us to the competition. Protein: GU Recovery Brew relies on whey protein isolate—not cheaper whey protein concentrate—to create a higher quality and more effective product. Amino Acids: Arginine and Glutamine promote recovery by mitigating the effects of intense training and supporting a strong immune system. Carbs: Both simple and complex carbs (and lots of ‘em!) in optimal balance will re-fuel your competitive fire and get you back to training and racing on schedule. Vitamins: Over 100% of daily allowances of vitamins C and E in every serving. This item is nonreturnable.