Thorne L-Glutamine Powder Review

L-glutamine is an amino acid that supports a healthy intestinal lining and immune function, and assists in healing after injury or surgery and in muscle cell repair. Thorne's L-Glutamine Powder is NSF Certified for Sport®. Evidence suggests supplemental L-glutamine benefits gastrointestinal health, supports cellular repair and collagen formation after surgery or repair, maintains immune health, and helps restore plasma glutamine levels depleted after periods of physical stress, such as prolonged exhaustive exercise.

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Product Focus: Digestion and Bloating

Tier ⓘ

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Members see this product's tier and why. Tiers run from 1, the strongest evidence, to 5. How we grade →

Evidence ⓘ

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How strongly the evidence says this product works: human studies count most, then real reviews, then our biohacker panel.

Positive Reviews

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Biohacker Mentions

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Cost per month

$21

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Study, Trial or Testing Result SummaryMembersHuman studies

Each scoop gives 5 grams of glutamine, so the 15 grams a day used in the studies is reached only at three servings a day. In 106 adults with diarrhea-type irritable bowel syndrome that began after an infection, 15 grams a day for 8 weeks greatly symptoms in about 80 percent of people versus about 6 percent on placebo, with bowel movements and firmer stools. …

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Review Totals and SummaryMembers727 reviews

727 reviews · Amazon 671 · Thorne 56

Customers consistently Thorne L-Glutamine Powder, with of star ratings being 4 or 5 across approximately 727 ratings. This indicates a very level of among users who have purchased and reviewed the product. **What it did for them** users report in their gastrointestinal . …

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Biohacker SummaryMembersWhat our biohacker panel says

of the panel or uses glutamine, and the common reason is gut support, with naming gut lining repair or leaky gut. Others take it for immune support during travel or illness, to sugar cravings, or for calm and recovery during stress or hard training. …

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RAL SummaryMembersThe tier and why

the fixed rules, the overall body of 16 human studies counts as showing , mainly because a pooled analysis of 1919 people found bowel . This is despite two placebo-controlled irritable bowel syndrome trials at 15 grams a day that did find .

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More DetailsMembersBody systems · Combine with · Possible side effects

Body systems: Digestive system. Combine with and possible side are for members.

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Supplement FactsL-Glutamine 5 g

Supplement Facts

Serving Size 1 scoop (5 g)

Servings Per Container 90

Amount Per Serving% Daily Value

L-Glutamine

5 g

†

† Daily Value not established.

Directions: Mix 1 scoop with at least 8 ounces of water, juice, or preferred beverage daily.

Barcode (UPC) 693749519027 · Label source: the brand's label · Report a label change

Where to BuyThorne · Amazon

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Graded October 23, 2026 by the Reverse Age Lab evidence engine, from human studies, real reviews and our biohacker panel. How we grade. Is this medical advice? No. Rala organizes the published evidence; go over any change with your doctor, especially if you take meds.