Your body naturally produces L-glutamine amino acid. L-glutamine can also be found in many foods. However, during periods of intense exercise, injury or illness, its level can be depleted,. Optimum Nutrition Glutamine Powder is a simple way to supplement a diet with L-glutamine amino acid. Muscle is broken down during your workout. After training, your body uses protein to repair the muscle fibres. Glutamine is the most abundant free amino acid in human muscle and is one of the building blocks of protein. Glutamine comprises more than 60% of the free amino acid pool in skeletal muscle and greater than 20% of total circulating amino acids. That is why Optimum Nutrition Glutamine Powder is recommended as pre-workout or post-workout food supplement for amateurs and professionals. It can be used before or after CrossFit workout, jogging, swimming, fitness and many other sports. Optimum Nutrition Glutamine Powder can be easily mixed in a glass of cold water, your favourite beverage or nutrition shake. One serving contains 5 g of unflavoured, pure L-glutamine. Ingredients L-glutamine Directions Simply add one level scoop (5.25 g) to 240 ml (8 oz) of cold water, your favourite beverage or ON Shake, and mix until powder is dissolved. Recommended daily consumption up to 2 servings per day.