Glutamine is an amino acid. Amino acids are molecules that play many roles in the body. Their main purpose is to serve as building blocks for proteins. Proteins are crucial to the organs. They also serve other functions, such as transporting substances in the blood and fighting off harmful viruses and bacteria. Like many other amino acids, it exists in two different forms - L-glutamine and D-glutamine. L-glutamine is used to make proteins and perform other functions, D-glutamine appears to be relatively unimportant in living organisms. L-glutamine can be produced naturally in your body. In fact, it is the most abundant amino acid in the blood and other body fluids L-glutamine is a non-essential amino acid and is made in our muscle tissue. As this amino acid occurs naturally in protein, which contributes to the growth and maintenance of muscle mass, glutamine is ideal to support your fitness progress. L-glutamine amino acid can be naturally found in food sources such as meat, fish, and eggs, making it tricky for anyone following a vegetarian or vegan diet to get enough from food alone. Even for those who do eat animal products, it can be time-consuming or expensive to get enough from meals alone - making our l-glutamine supplements a great way to stay topped up.