Muscle Rulz Glutamine Powder Original restores depleted levels of this amino acid and aids protein synthesis for improved overall performance. The powder is highly concentrated and contains more essential glutamine than food sources alone. It is incredibly versatile and mixes easily into whey protein and other mass gainer shakes for easy and convenient supplementation throughout the day and while on the go. It is very fashionable among athletes because of research supporting its use in both pre-and post-workout formulations.