Life Extension L-Glutamine
- Antioxidant
- Bottle
- Vegetarian
- Capsule
- Better rated than 82%
- More reviewed than 82%
A standard 500 mg vegetarian L-glutamine capsule for personal use, mislabeled here as a pet item, so confirm it's what you're looking for before ordering.
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How it ranks among the 28 antioxidants we track
4.6★ across 2,000 Amazon ratings, Bayesian-smoothed toward the category average.
2,000 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
1,000+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 28 antioxidants we track - how the scorecard works · full antioxidants data report. Confidence: high - strong rating volume and complete data.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
This is Life Extension's L-Glutamine, a 500 mg amino acid capsule supplement, not a pet product despite how it's filed here. It's a vegetarian capsule formula sold in 100-count bottles.
The category label on this listing reads Pet Supplies, but the brand, dosage form and Amazon ranking (Health & Household, L-Glutamine Nutritional Supplements) all point to a human dietary supplement rather than anything formulated for animals. Treat the pet supplies category tag as a listing error and shop it as what the title and specs describe.
- 500 mg L-glutamine per capsule
- 100 vegetarian capsules per bottle
- Gluten free, non-GMO
- Made by Life Extension
Who it's for
Adults looking for an L-glutamine amino acid supplement to support muscle mass, energy under physical stress, or gut and immune health. Not an animal product despite its placement in a pet supplies search.
Strengths and trade-offs
Drawn from this product's published specifications.
- Vegetarian capsule form
- Gluten free and non-GMO
- 100 capsules per bottle, roughly a month's supply at typical single daily dosing
- Listed under Pet Supplies despite being a human supplement, easy to order by mistake
- No pet dosing information provided since it isn't formulated for animals
Performance notes
L-glutamine is an amino acid the body draws on more heavily during physical stress, and supplementing it is commonly aimed at supporting muscle recovery and gut lining integrity rather than producing an immediate, noticeable effect.
Specifications
| Brand | Life |
|---|---|
| Model | 00345 |
| Dimensions & fit | |
| Item Weight | 0 ounces |
| Item Dimensions | 2 × 2 × 3.8 inches |
| Capacity & performance | |
| Age Range Description | Adult |
| Construction & materials | |
| Material Type Free | Gluten Free, Non-GMO |
| Material Features | Vegetarian |
| Color | White |
| Included components | |
| Unit Count | 100 |
| Other details | |
| Container Type | Bottle |
| Diet Type | Vegetarian |
| Dosage Form | Capsule |
| Primary Supplement Type | L-Glutamine (free form amino acid) |
| Number Of Items | 1 |
| Allergen Information | Gluten Free |
| Manufacturer Part Number | 00345 |
| Flavor | Unflavored |
| Upc | 737870345107 |
| Customer Reviews | {'ratings_count': '2,057', 'stars': '4.6'} |
| Item Nype Name | L-Glutamine Supplement |
| Model Name | L-Glutamine |
| Specific Uses For Product | Active Lifestyle & Fitness, GI Health, Immune Support |
| Asin | B000LVFIZ0 |
| Best Sellers Rank | #21,597 in Health & Household (See Top 100 in Health & Household) #20 in L-Glutamine Nutritional Supplements |
| Special Ingredients | L-Glutamine (free form amino acid) |
| Manufacturer | Life Extension |
| Total Servings Per Container | 100 |
| Item Form | Capsule |
| Model Number | 00345 |
| Product Benefits | Supports healthy muscle mass, Helps maintain energy levels under heavy stress, Helps maintain optimal immune function & gut health |
How it compares
This product against the closest alternatives we track in antioxidants.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Life Extension L-GlutamineThis product | 4.6 / 5 | 2,000 | 4.4 / 5 |
| Amazing Turmeric for Dogs Curcumin Pet AntioxidantAmazing | 4.4 / 5 | 8,000 | 4.4 / 5 |
| Virbac REBOUND® Recuperation Formula for DogsVirbac | 4.5 / 5 | 2,200 | 4.3 / 5 |
| NaturVet Aller-911 Advanced Allergy Aid for DogsNaturVet | 4.4 / 5 | 3,700 | 4.2 / 5 |
| Dr. Harvey's Coenzyme Q10Dr | 4.6 / 5 | 472 | 4.2 / 5 |
Similar antioxidants from other brands
Questions about the Life 00345
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
Is this product meant for pets?
No. Despite its placement under Pet Supplies, the brand, dosage and Amazon ranking all indicate this is a human dietary supplement.
Is the capsule vegetarian?
Yes, it's a vegetarian capsule formula.
How much L-glutamine is in each capsule?
500 mg per capsule, with 100 capsules per bottle.