Best L-Glutamine
The best l-glutamine we track, ranked by real cost-per-dose — not paid placements. Across 22 brands, 4 are third-party tested in a public registry.
Updated October 2026prices checked what’s changed
How much does L-Glutamine cost?
L-Glutamine costs a median $0.14 per serving — the cheapest of the 29 we can price per dose is $0.06 per serving. Prices checked October 2026.
Ranked across 29 products · prices checked Oct 10, 2026
3rd-party testedOptimum Nutrition L-Glutamine Muscle Recovery Capsules
NSF Certified for Sport brand at $0.08 per serving.
How we rank
We rank by cost-per-dose — price ÷ servings, normalized to the daily dose — so bottle sizes and strengths compare fairly. Prices are scraped at publication and re-checked when the catalog refreshes (see the “Prices checked” stamp above). There is no paid placement and no kickback for ordering. Full methodology · Editorial standards.
When cheapest ≠ best value
The cheapest bottle isn’t automatically the best value: a low per-bottle price usually just means fewer servings or a smaller dose per serving. That is exactly what cost per dose normalises, which is why the ranking above is ordered by it rather than by sticker price. A bigger bottle isn’t automatically cheaper per dose either — this list already ranks by cost per dose, so a larger count only wins if it truly costs less per serving. Compare L-Glutamine forms.
Our data on this: how much the big bottle saves per serving · the gummy tax · the form premium · the price spread.
Full ranking by cost per dose
Cost-per-serving normalizes price across bottle sizes — a 60-count and a 365-count compare fairly. Top 20 of 29 shown.
- See offer$0.06per serving
- See offer$0.06per serving1.1× #1
- See offer$0.08per serving1.4× #1
- See offer$0.08per serving1.5× #1
- See offer$0.08per serving1.5× #1
- See offer$0.08per serving1.5× #1
- See offer$0.08per serving1.5× #1
- See offer$0.08per serving1.5× #1
- See offer#9Optimum Nutrition L-Glutamine Muscle Recovery Capsules
capsule · 1000mg · 240 servings · $19.99
NSF Sport$0.08per serving1.5× #1 - See offer$0.09per serving1.6× #1
- See offer$0.11per serving2.0× #1
- See offer#12NOW Sports, L-Glutamine 1,000 mg, Double Strength, Amino…
capsule · 1000mg · 240 servings · $28.99
$0.12per serving2.2× #1 - See offer$0.13per serving2.3× #1
- See offer$0.14per serving2.4× #1
- See offer$0.14per serving2.5× #1
- See offer$0.14per serving2.5× #1
- See offer$0.16per serving2.9× #1
- See offer$0.18per serving3.2× #1
- See offer$0.19per serving3.4× #1
- See offer$0.19per serving3.5× #1
See also: L-Glutamine basics · all best-value rankings · l-glutamine cost-per-dose breakdown
L-Glutamine brands we compare — which are third-party tested?
4 of the 22 brands ranked above appear in an independent certifier's own public registry. A certification confirms the label matches the contents — it says nothing about how well the supplement works, and an uncertified brand is not automatically worse.
- BulkSupplements.com NSF Sport
- Natural Factors USP
- Optimum Nutrition NSF Sport
- Thorne NSF Sport
- Amazing Nutrition
- Best Naturals
- Codeage
- Double Wood Supplements
- Jarrow Formulas
- Kaged
- Life Extension
- Micro Ingredients
- NAKED
- NOW
- NOW Foods
- NutraBio
- Nutricost
- PROTOCOL FOR LIFE BALANCE
- Pure Encapsulations
- Solgar
- Type Zero
- Vitamatic
Frequently asked
How much does L-Glutamine cost?+
The cheapest l-glutamine we track is $0.06 per serving ($9.99 for 180 servings), against a typical $0.14 per serving across the 29 we can price per dose — about $1.67 a month at the cheapest. That's real cost per dose from live Amazon US prices as of October 2026, not the sticker price.
What is the best-value L-Glutamine supplement?+
Vitamatic L-Glutamine 1000 mg Per Serving — $0.06 per serving ($9.99 for 180 servings), the lowest cost-per-dose l-glutamine in our Amazon US catalog as of October 2026.
How much does L-Glutamine cost per day?+
The cheapest l-glutamine we track works out to $0.06 per serving, against a typical $0.14 per serving across the 29 we can price per dose. Retailers and review sites list a price and a serving size but rarely divide it out — this is what a day actually costs, as of October 2026.
What is the typical cost per dose for L-Glutamine?+
About $0.14 per serving across the 29 l-glutamine products we can price per dose (combination products are left out — their single label dose belongs to whichever ingredient the product is built around) — the cheapest we track is $0.06 per serving, with most falling between $0.08 and $0.23.
What is the highest-quality L-Glutamine supplement?+
Of the 22 l-glutamine brands ranked here, 4 hold a third-party certification we could verify in a public registry: BulkSupplements.com (NSF Certified for Sport), Natural Factors (USP Verified), Optimum Nutrition (NSF Certified for Sport), Thorne (NSF Certified for Sport). Certification means an independent lab confirmed the label matches the contents and screened for contaminants — it does not rate how well the supplement works. The cheapest certified option is Optimum Nutrition L-Glutamine Muscle Recovery Capsules at $0.08 per serving.
Which L-Glutamine brands are third-party tested?+
BulkSupplements.com — NSF Certified for Sport; Natural Factors — USP Verified; Optimum Nutrition — NSF Certified for Sport; Thorne — NSF Certified for Sport. We only count a brand as tested when it appears in the certifier's own public registry (USP Verified, NSF Certified for Sport, Informed Choice), never on a claim printed on the label. The remaining 18 brands on this page have no certification we could verify.
Which L-Glutamine is the top rated?+
We don't republish marketplace star ratings — they belong to the retailer, they move constantly, and a 4.6 average tells you nothing about what is in the capsule. The two things you can verify are what a dose costs and whether an independent lab checked the label. On both counts, Optimum Nutrition L-Glutamine Muscle Recovery Capsules stands out: NSF Certified for Sport certified at $0.08 per serving.
What dose of L-Glutamine do these supplements come in?+
The l-glutamine products we track range from 500mg to 5000mg per serving. We rank by cost per serving so you can compare value across strengths — check the label for the dose that suits you.
Independent testing
4 of 22 tracked L-Glutamine brands here are flagged as carrying independent third-party testing — a voluntary check of a product's identity, potency and contaminants by an outside lab. It's a quality signal, not a value or efficacy claim. Confirm any brand's current status on the official registries:
Testing status is self-reported by the brand or drawn from public certification and may change — always verify on the official registry before purchase.
References & sources
- L-Glutamine — Health Professional fact sheet — NIH Office of Dietary Supplements
- USP Verified product participants — U.S. Pharmacopeia
- NSF certified products — NSF
We link primary sources and paraphrase their findings — never copy their text, tables, or images. Cost-per-dose figures are our own first-party catalog data.