4.6(2,000)Amazon rating$11.251,000+ bought last month
Our verdict
Life Extension's L-Glutamine capsule is formulated and sold as a human amino acid supplement, not a dog-specific product, so despite its strong 4.6 star rating across thousands of reviews, it isn't something to give your dog without first checking the dose and appropriateness with your vet.
Owners who've been specifically directed by a vet to supplement L-glutamine and want a well-reviewed, gluten-free, non-GMO capsule option, understanding that the label's dosing is written for humans, not dogs.
Skip if
You're looking for a supplement made and dosed specifically for dogs, or you don't have vet guidance on whether and how much L-glutamine your dog actually needs.
Form Capsule
Flavor Unflavored
Benefits Supports Healthy Muscle Mass, Helps Maintain Energy Levels Under Heavy Stress, Helps Maintain Optimal Immune Function & Gut Health
Best for Active Lifestyle & Fitness, Gi Health, Immune Support
Weight 500 Milligrams
Priced 53% below the category median ($23.95 across 26 tracked models)
Our scorecard
4.6/5overall
Owner rating4.6/5
4.6 average across 2,000 owner ratings
Popularity4.5/5
2,000 owner reviews, more than most models here
The overall score is owner satisfaction weighted by how many reviews back it, so a high rating from few reviews counts for less. The bars below show where this model stands against the other dog food and health supplements we track in this category on price, popularity and size. Context, not marks against it, and our read of the data, not a lab test.
Overview
['This product is a 500 mg L-glutamine capsule from Life Extension, formulated for adult human use in a gluten-free, non-GMO, vegetarian capsule, with label claims around muscle health, energy under stress, and immune and gut health support.', "It shows up in dog amino acid supplement searches because L-glutamine is an amino acid some owners look into for their dogs' digestive or muscle health, but the product itself carries no dog-specific dosing, target species listing, or pet-formulated claims.", "At $11.25 for 100 capsules, it's an inexpensive source of L-glutamine with a very strong 4.6 star average across thousands of reviews, but those reviews reflect human use, and giving it to a dog means opening a capsule and estimating a dose without label guidance for pets."]
Very strong 4.6 star rating across a large review base
Affordable per-capsule cost
Simple single-ingredient L-glutamine formula
Cons
Not formulated, labeled, or dosed for dogs
No target species or pet-specific serving guidance on the label
Requires opening capsules and estimating a dose, which should only be done with vet input
Reviews reflect human users, not dog owners
Specifications
Form
Capsule
Flavor
Unflavored
Benefits
Supports Healthy Muscle Mass, Helps Maintain Energy Levels Under Heavy Stress, Helps Maintain Optimal Immune Function & Gut Health
Best for
Active Lifestyle & Fitness, Gi Health, Immune Support
Weight
500 Milligrams
Performance notes
L-glutamine is an amino acid sometimes discussed in relation to gut lining and muscle recovery, but this capsule's 500 mg dose and vegetarian capsule shell are sized around human serving amounts. Using it for a dog means the capsule contents would need to be measured out separately, since there is no pet dosing chart included.
What buyers say
With roughly 2,057 reviews and a 4.6 star average, plus about 1,000 bought in the past month, this is clearly a well-liked product, but that popularity and feedback come from the human supplement market rather than dog owners specifically.
No. It's a human dietary supplement with no dog-specific labeling, dosing or target species listed. Any use in dogs would be off-label and should only be done with a vet's guidance.
Why would this show up in a dog supplement search?
L-glutamine is an amino acid some owners research for their dogs' gut or muscle health, so this human capsule sometimes appears alongside dog-specific amino acid products, even though it isn't formulated for pets.
What should I do if I want to give my dog L-glutamine?
Talk to your vet first. They can tell you whether your dog needs it, what a safe dose looks like for their size and health, and whether a dog-specific supplement would be a better fit than a human capsule.
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