L-Glutamine Side Effects

L-Glutamine is an amino acid used to help synthesize proteins. It is supplied as white crystals/crystalline powder, and may be used in dietary supplements. Though it’s considered safe, some are convinced it has potentially dangerous health effects.

What Is L-Glutamine?

L-Glutamine is an important amino acid that builds protein in the body. This product appears as a crystalline powder, and it can be used as a dietary supplement to cure gastric and duodenal ulcer, gastritis, and hyperchlorhydria. It is important for maintaining the suppression, structure and function of the small intestine.

Possible Side Effects of L-Glutamine

L-Glutamine is generally considered a safe ingredient. The side effects may:

  • Blood in urine
  • changes in skin color
  • chills
  • cold hands and feet
  • confusion
  • cough
  • difficulty swallowing
  • dizziness
  • fainting
  • fast heartbeat
  • fever
  • frequent and painful urination
  • headache
  • hives
  • itching
  • lightheadedness
  • lower back or side pain
  • pain, redness, or swelling in arm or leg
  • puffiness or swelling of the eyelids or around the eyes, face, lips or tongue
  • rapid, shallow breathing
  • shortness of breath
  • skin rash
  • stomach pain
  • sudden decrease in amount of urine
  • tightness in chest
  • unusual tiredness or weakness
  • wheezing

GRAS Affirmation: Yes

Generally recognized as safe (GRAS) is an American Food and Drug Administration (FDA) designation that a chemical or substance added to food is considered safe by experts, and so is exempted from the usual Federal Food, Drug, and Cosmetic Act (FFDCA) food additive tolerance requirements. L-Glutamine is considered safe by FDA.

Suggested Dosage


Special Populations Precaution

There is a lot of concern about diet and nutrition for these population, like Newborns, children, pregnant, sensitive to L-Glutamine populations. Better consult to your doctor if you would like to intake L-Glutamine.



Related Research

1. Risk assessment for the amino acids taurine, L-glutamine and L-arginine. [Regul Toxicol Pharmacol. 2008 Apr] Author: Shao A, Hathcock JN.

2. L-Glutamine Supplementations Enhance Liver Glutamine-Glutathione Axis and Heat Shock Factor-1 Expression in Endurance-Exercise Trained Rats. [Int J Sport Nutr Exerc Metab. 2014 Sep 8] Author: Petry ER, Cruzat VF, Heck TG, Homem de Bittencourt PI Jr, Tirapegui J.

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