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L-Glutamine Review

Summary

What is L-glutamine?

Glutamine (L-glutamine) is an amino acid that your body produces. It is involved in cellular energy production and plays a role in maintaining muscle cells, the immune system, and the digestive tract.(See details in What It Is).

What are the health benefits of L-glutamine?

Although you do not need to get glutamine from your diet or supplement with it, there is some evidence that large doses (several grams) may reduce infections after over-training, reduce symptoms of irritable bowel syndrome after infections, and reduce mouth irritation due to chemotherapy (see details in What It Does).

How much L-glutamine is taken?

Typical dosage of L-glutamine is 4 to 6 grams (4,000 to 6,000 mg) taken one or more times daily (see details in ConsumerTips).

Which L-glutamine supplement is best?

Nearly all L-glutamine supplements contain essentially the same L-glutamine in its free form. However, the cost can range from just 4 cents to 56 cents per gram. Among products Approved for quality in ConsumerLab ’s tests of popular L-glutamine supplements (see What CL Found), ConsumerLab selected a Top Pick for L-glutamine powder and a Top Pick for L-glutamine capsules, each of which represent exceptional value relative to other products.

What to look for on L-glutamine labels?

L-glutamine is sold almost exclusively in the free form and is produced by fermentation, so it is not necessary to pay more for products claiming to be “free form.”

L-glutamine safety and side effects:

Glutamine is believed to be generally safe but can cause gastrointestinal side effects at daily doses of 10 grams or more. Lower doses may cause symptoms in people hypersensitive to MSG (monosodium glutamate). Dry mouth, headache, and dizziness may occur with daily doses of 30 grams or more. There is concern glutamine may interfere with anti-epilepsy drugs and may trigger mania in people with bipolar disorder. (See details in Concerns and Cautions).

Make sure you're choosing the best glutamine supplement approved in our tests!

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L-Glutamine supplements compared in this review

View Larger Image BulkSupplementscom_L-Glutamine-L-Glutamine-small.png

BulkSupplements.com L-Glutamine

View Larger Image NOW_L-Glutamine_500_mg-L-Glutamine-small.png

NOW L-Glutamine 500 mg

View Larger Image NOW_Sports_L-Glutamine_Powder-L-Glutamine-small.png

NOW Sports L-Glutamine Powder

View Larger Image Nutricost_L-Glutamine-_Unflavored-L-Glutamine-small.png

Nutricost L-Glutamine - Unflavored

View Larger Image Pure_Encapsulation_L-Glutamine_500_mg-L-GlutaminePure_Encapsulation_L-Glutamine_500_mg-L-Glutamine-small.png

Pure Encapsulations L-Glutamine 500 mg

View Larger Image Swanson_L-Glutamine_Powder-L-Glutamine-small.png

Swanson L-Glutamine Powder

View Larger Image Thorne_L-Glutamine_Powder-L-Glutamine-small.png

Thorne L-Glutamine Powder

You must be a member to get the full test results along with ConsumerLab.com recommendations and quality ratings. You will get results for 7 L-glutamine supplements selected for testing by ConsumerLab.

In this comprehensive review, you'll discover:

  • Which L-glutamine supplements products passed or failed testing
  • Which L-glutamine supplements offer the best quality and value and are CL's Top Picks
  • If L-glutamine supplement labels are accurate
  • What it really means if an L-glutamine supplement is or is not labeled as containing the "free form" of glutamine
  • The health benefits of L-glutamine, and if it can help to boost the immune system, improve exercise performance, or protect the stomach from NSAIDS
  • What to look for when choosing an L-glutamine supplement and the best way to take and store L-glutamine supplements

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Additional Information
Tested through CL's Quality Certification Program prior to, or after initial posting of this Product Review.