Glutamine, L-Glutamine

Glutamine is a nonessential amino acid and a fundamental organic molecule for the body’s function. It is responsible for protein synthesis, it helps build muscles, tendons, cartilage, nails and hormones. Glutamine is more abundant in muscle tissue but it acts as an energy nutrient for immune cells. There are two different forms of this amino acid: L-glutamine and D-glutamine, with L-glutamine being the most common form found in foods and supplements, while D-glutamine does not seem to matter much to the body.


  • Origin Animal Product, Nonessential, Synthetic
  • Source Milk, Eggs, Meat
  • Type Amino Acid
  • Age Range Teenagers (13-19), Adults (20-59), Seniors (>60)
  • Toxicity May be toxic in high doses
  • Side effects No adverse side effects reported untill now
  • Warnings Hepatic Diseases

Why be Careful

High doses of glutamine have been evaluated and had no side effects, which may indicate that glutamine supplementation is safe, but further studies are needed to prove the safety and toxicity of this supplement. Individuals with liver disease should avoid using glutamine, as it may aggravate this condition. Prescription is recommended in these cases.