Universal Nutrition Animal Nitro Aids Recovery. Withstand the Toughest Exercises and Heaviest Weights, You Can Rebuild and Repair Torn Muscle Tissue. Carrying Weights is Only an Aid. Protein and Amino Acids Can Be Properly and Effectively Processed to Efficiently Target Entry Into the Systemic Circulation. To Build Muscle Completely. To Grow Bigger and Stronger Muscle Tissue.