L-Glutamine
Capsules and powders are ranked separately: each has its own table, and neither is priced against the other.
Powder
Our pick, delivery included
Thorne L-Glutamine Powder (90 servings)$0.744per 5g, delivered$22.33 a month
Cheapest per 5g, delivery known · Cheapest independently tested, delivery known
Sports Research L-Glutamine, Unflavored (500 g)$0.355per 5g, delivered$10.64 a month
Not our pick: its price was last read Nov 4, 2026 and we cannot refresh it automatically.
Last known price, Nov 4, 2026; we have no automatic way to refresh Sports Research (direct)'s prices.
Cheapest independently tested, delivery not published
BulkSupplements.com L-Glutamine Powder, Mango Tango (700 g)Tied at the same price per 5g with BulkSupplements.com L-Glutamine Powder, Lemon Italian Ice (700 g) and BulkSupplements.com L-Glutamine Powder, Sour Apple (700 g).
$0.34per 5g, before delivery$10.19 a month
Not our pick: delivery cost is not published.
Delivery is extra and not published; free from $59.01.
How these lines are chosen
Among 27 products and 27 retailer listings we track; Amazon and Walmart are not included. A month is thirty doses of 5g, priced the same way as the figure beside it. It is worked out before that figure is rounded, so it can differ from thirty times it by a few cents. It is not thirty servings where a serving holds more or less than 5g. “Delivery known” ranks only products whose retailer publishes a delivery rate. A cheaper product whose rate is not published gets a line of its own, or is in the full list below.
Why this pick, and what came closest
Not a score, no weightings to argue with. It is the cheapest per delivered dose among products whose delivery cost we know and that clear four factual bars:
- a certification we confirmed applies to this package, naming it where the certifier names packages
- no recall, warning letter or failed test in the sources we checked
- a current price, not a last known one
- no more than a year's supply at the label's serving
It is provisional. It is the best answer among the products, retailers and sources we have checked, and that set is still narrow.
BulkSupplements.com L-Glutamine Powder, Mango Tango (700 g) is $25.04 short of free delivery, worth it if you are buying something else anyway, at $0.34/dose, verification level A.
BulkSupplements.com L-Glutamine Powder, Lemon Italian Ice (700 g) is $25.04 short of free delivery, worth it if you are buying something else anyway, at $0.34/dose, verification level A.
Sports Research $0.355 is cheaper, but its price was last read Nov 4, 2026 and we cannot refresh it automatically.
Capsules, softgels and tablets
Cheapest per 5g, delivery known
Optimum Nutrition Glutamine Capsules (240 capsules)$1.21per 5g, delivered$36.23 for thirty doses of 5g
How these lines are chosen
Among 5 products and 5 retailer listings we track; Amazon and Walmart are not included. A month is thirty doses of 5g, priced the same way as the figure beside it. It is worked out before that figure is rounded, so it can differ from thirty times it by a few cents. It is not thirty servings where a serving holds more or less than 5g. “Delivery known” ranks only products whose retailer publishes a delivery rate. A cheaper product whose rate is not published is in the full list below.
Nothing here clears every bar, so there is no pick
A pick has to clear four bars:
- independently certified, and named at the exact package where the certifier names packages
- no recall or failed test
- a price its retailer let us read recently
- no more than a year’s supply at the label’s serving
Where a retailer does not publish a delivery rate, the pick is priced before delivery and says so. These came closest, with what stopped each one:
BulkSupplements.com L-Glutamine 5,000 mg (360 capsules) $0.433 per 5g, before delivery, its only listing names the same ingredient in another form. Free delivery starts at $59.01, so this order is $33.04 short.
Nutricost L-Glutamine 800 mg (180 capsules) $0.624 per 5g, before delivery, no independent verification we could locate. Free delivery starts at $59.01, so this order is $41.04 short.
Optimum Nutrition Glutamine Capsules (240 capsules) $1.21 per 5g, delivered, no independent verification we could locate. Free delivery starts at $75.01, so this order is $52.02 short.
Powders and capsules are each ranked on their own, priced per 5 g of L-glutamine as each panel prints it. The 5 g is a yardstick for comparing prices, not a suggested dose.
Prices are checked daily where a store can be read automatically; Sports Research is read by hand, less often, and a price past its date says so. Every figure links to its source. Where the data comes from
Of the 32 products here:
- 6 named at the exact package by a certifier
- 2 certified with no package named
- 2 whose listing names another form only
- 16 in no database we searched
- 6 not settled
Powder
27 of 27 products
22 rows marked + delivery exclude an unpublished delivery charge, so their real cost per dose is higher.
Tested? A Certified · B Tested · C Claimed · D None located · A? listed, not confirmed at this package · not settled: a certifier’s entry may cover it
NUTR
MI
BULK
SR
DWS
NUTR
SR
MUSC
BULK
ON
NUTR
BULK
BULK
BULK
NUTR
BULK
NUTR
NUTR
NUTR
EN
NUTR
EN
BULK
ON
MOME
THOR
BULK
| Product | Delivery | |||||
|---|---|---|---|---|---|---|
NUTR | $0.165 $4.95/mo + delivery | D · None located Could not locate independent data | $32.97 checked Nov 13, 2026 | not free $26.04 short | 200 6.6 months at 1/day | Buy Nutricost (direct) |
MI | $0.185 $5.54/mo + delivery | D · None located Could not locate independent data | $36.95 checked Nov 13, 2026 | not free $22.05 short | 200 6.6 months at 1/day | Buy Micro Ingredients (direct) |
BULK BulkSupplements.com L-Glutamine Powder, Unflavored (1 kg) powder · 1000 g · 5g per serving · 2.00 per dose | $0.20 $6.00/mo + delivery | D · Not settled A certifier’s entry may cover this package | $39.97 checked Nov 13, 2026 | not free $19.04 short | 200 6.6 months at 1/day | Buy BulkSupplements.com |
SR | $0.25 $7.49/mo | B · Informed Sport Independently tested | $14.97 stale, checked Nov 4, 2026 | $7.50 | 60 60 days at 1/day | Check price Sports Research (direct) |
DWS | $0.25 $7.49/mo + delivery | D · None located Could not locate independent data | $24.95 checked Nov 13, 2026 | not free $5.06 short | 100 3.3 months at 1/day | Buy Double Wood Supplements (direct) |
NUTR | $0.26 $7.79/mo + delivery | D · None located Could not locate independent data | $25.97 checked Nov 13, 2026 | not free $33.04 short | 100 3.3 months at 1/day | Buy Nutricost (direct) |
SR | $0.28 $8.39/mo | B · Informed Sport Independently tested | $27.95 stale, checked Nov 4, 2026 | $7.50 | 100 3.3 months at 1/day | Check price Sports Research (direct) |
MUSC | $0.283 $8.50/mo + delivery | D · None located Could not locate independent data | $16.99 checked Nov 13, 2026 | not free $13.02 short | 60 60 days at 1/day | Buy MuscleTech (direct) |
BULK BulkSupplements.com L-Glutamine Powder, Unflavored (500 g) powder · 500 g · 5g per serving · 2.00 per dose | $0.29 $8.69/mo + delivery | D · Not settled A certifier’s entry may cover this package | $28.97 checked Nov 13, 2026 | not free $30.04 short | 100 3.3 months at 1/day | Buy BulkSupplements.com |
ON | $0.332 $9.97/mo | D · Not settled A certifier’s entry may cover this package | $64.49 checked Nov 13, 2026 | $5.99 | 194 6.4 months at 1/day | Buy Optimum Nutrition (direct) |
NUTR | $0.337 $10.11/mo + delivery | D · None located Could not locate independent data | $27.97 checked Nov 13, 2026 | not free $31.04 short | 83 83 days at 1/day | Buy Nutricost (direct) |
BULK BulkSupplements.com L-Glutamine Powder, Mango Tango (700 g) powder · 700 g · 5g per serving · 3.00 per dose | $0.34 $10.19/mo + delivery | A · NSF Certified for Sport Independently certified | $33.97 checked Nov 13, 2026 | not free $25.04 short | 100 3.3 months at 1/day | Buy BulkSupplements.com |
BULK BulkSupplements.com L-Glutamine Powder, Lemon Italian Ice (700 g) powder · 700 g · 5g per serving · 3.00 per dose | $0.34 $10.19/mo + delivery | A · NSF Certified for Sport Independently certified | $33.97 checked Nov 13, 2026 | not free $25.04 short | 100 3.3 months at 1/day | Buy BulkSupplements.com |
BULK BulkSupplements.com L-Glutamine Powder, Sour Apple (700 g) powder · 700 g · 5g per serving · 3.00 per dose | $0.34 $10.19/mo + delivery | A · NSF Certified for Sport Independently certified | $33.97 checked Nov 13, 2026 | not free $25.04 short | 100 3.3 months at 1/day | Buy BulkSupplements.com |
NUTR | $0.341 $10.23/mo + delivery | D · None located Could not locate independent data | $27.97 checked Nov 13, 2026 | not free $31.04 short | 82 82 days at 1/day | Buy Nutricost (direct) |
BULK BulkSupplements.com L-Glutamine Powder, Orange Smash (700 g) powder · 700 g · 5g per serving · 3.00 per dose | $0.35 $10.49/mo + delivery | A · NSF Certified for Sport Independently certified | $34.97 checked Nov 13, 2026 | not free $24.04 short | 100 3.3 months at 1/day | Buy BulkSupplements.com |
NUTR | $0.359 $10.76/mo + delivery | D · None located Could not locate independent data | $27.97 checked Nov 13, 2026 | not free $31.04 short | 78 78 days at 1/day | Buy Nutricost (direct) |
NUTR | $0.359 $10.76/mo + delivery | D · None located Could not locate independent data | $27.97 checked Nov 13, 2026 | not free $31.04 short | 78 78 days at 1/day | Buy Nutricost (direct) |
NUTR | $0.359 $10.78/mo + delivery | D · None located Could not locate independent data | $17.97 checked Nov 13, 2026 | not free $41.04 short | 50 50 days at 1/day | Buy Nutricost (direct) |
EN | $0.367 $11.00/mo + delivery | D · None located Could not locate independent data | $21.99 checked Nov 13, 2026 | not free $57.02 short | 60 60 days at 1/day | Buy EVLution Nutrition (direct) |
NUTR | $0.368 $11.04/mo + delivery | D · None located Could not locate independent data | $27.97 checked Nov 13, 2026 | not free $31.04 short | 76 76 days at 1/day | Buy Nutricost (direct) |
EN | $0.416 $12.48/mo + delivery | D · None located Could not locate independent data | $24.95 checked Nov 13, 2026 | not free $100.05 short | 60 60 days at 1/day | Buy Evogen Nutrition (direct) |
BULK BulkSupplements.com L-Glutamine Powder, Unflavored (250 g) powder · 250 g · 5g per serving · 2.00 per dose | $0.479 $14.38/mo + delivery | D · Not settled A certifier’s entry may cover this package | $23.97 checked Nov 13, 2026 | not free $35.04 short | 50 50 days at 1/day | Buy BulkSupplements.com |
ON | $0.491 $14.74/mo | D · Not settled A certifier’s entry may cover this package | $28.49 checked Nov 13, 2026 | $5.99 | 58 58 days at 1/day | Buy Optimum Nutrition (direct) |
MOME | $0.667 $20.00/mo + delivery | A · NSF Certified for Sport Independently certified | $39.99 checked Nov 13, 2026 | not free | 60 60 days at 1/day | Buy Momentous (direct) |
THOR | $0.744 $22.33/mo | A · NSF Certified for Sport Independently certified | $67.00 checked Nov 13, 2026 | free | 90 3.0 months at 1/day | Buy Thorne (direct) |
BULK BulkSupplements.com L-Glutamine Powder, Unflavored (100 g) powder · 100 g · 5g per serving · 2.00 per dose | $1.05 $31.46/mo + delivery | D · Not settled A certifier’s entry may cover this package | $20.97 checked Nov 13, 2026 | not free $38.04 short | 20 20 days at 1/day | Buy BulkSupplements.com |
Capsules, softgels and tablets
5 of 5 products
3 rows marked + delivery exclude an unpublished delivery charge, so their real cost per dose is higher.
Tested? A Certified · B Tested · C Claimed · D None located · A? listed, not confirmed at this package
BULK
NUTR
ON
DWS
THOR
| Product | Delivery | |||||
|---|---|---|---|---|---|---|
BULK | $0.433 $12.99/mo + delivery | A? · Listing names another form listing names another form | $25.97 checked Nov 13, 2026 | not free $33.04 short | 60 60 days at 1/day | Buy BulkSupplements.com |
NUTR Nutricost L-Glutamine 800 mg (180 capsules) capsule · 0.8g per serving · 6.25 per dose Also contains, not counted in the price per dose: acacia fiber (Acacia senegal) (gum) 30 mg | $0.624 $18.72/mo + delivery | D · None located Could not locate independent data | $17.97 checked Nov 13, 2026 | not free $41.04 short | 180 = 29 doses 29 days at 1/day | Buy Nutricost (direct) |
ON | $0.958 $28.74/mo | D · None located Could not locate independent data | $22.99 checked Nov 13, 2026 | $5.99 | 120 = 24 doses 24 days at 1/day | Buy Optimum Nutrition (direct) |
DWS Double Wood Supplements L-Glutamine 1,000 mg (120 capsules) capsule · 1g per serving · 10.00 per dose | $1.25 $37.38/mo + delivery | D · None located Could not locate independent data | $14.95 checked Nov 13, 2026 | not free $15.06 short | 60 = 12 doses 12 days at 1/day | Buy Double Wood Supplements (direct) |
THOR | $2.89 $86.67/mo | A? · Listing names another form listing names another form | $26.00 checked Nov 13, 2026 | free | 90 = 9 doses 9 days at 1/day | Buy Thorne (direct) |
Common questions
Which L-glutamine brands are third-party tested?
Every L-glutamine we price, grouped by whether a certifier names the exact package sold, lists it without confirming it, or lists nothing we found.
L-glutamine powder vs capsules: what is the difference in price?
What 5 g of L-glutamine costs as powder and as capsules, and how many capsules make 5 g, from each label. The 5 g is a yardstick, not a suggested dose.
What is the cheapest NSF certified L-glutamine?
Every L-glutamine we track whose exact package appears in NSF’s Certified for Sport database, ranked per 5 g. Each price says whether it includes delivery.
Do third-party tested supplements cost more?
Per category, we compare the cheapest product we track with the cheapest a certifier names at the exact package: one format, and one strength where it matters.
Is BulkSupplements third party tested?
Every BulkSupplements product we track, grouped by what we found: a listing at the exact package, at another size or form, one not yet settled, or none. With listing IDs.
Is BulkSupplements L-glutamine NSF certified?
BulkSupplements L-glutamine bags and capsules checked against NSF Certified for Sport: which packages a listing names, what it prints, and its ID.
Is Thorne L-glutamine NSF certified?
Thorne L-glutamine powder and capsules checked against NSF Certified for Sport: which packages a listing names, with the listing IDs.
Is Sports Research L-glutamine third party tested?
Sports Research L-glutamine checked against Informed Sport and NSF Certified for Sport, and whether each listing covers the tub sizes we price.
Is Thorne third party tested?
Every Thorne product we price, checked in NSF’s Certified for Sport database: which listing names the exact package sold, with the listing IDs.
Is Optimum Nutrition third party tested?
Every Optimum Nutrition product we track, checked in the certifier databases: what each listing covers, package by package, with the listing IDs.
Is Momentous third party tested?
Every Momentous product we price, checked in NSF’s Certified for Sport database: where a listing names the exact package, and where it names another size.
Which supplements are NSF Certified for Sport?
Every package we track that NSF names in its Certified for Sport database, by supplement and brand, with the listing IDs and what each listing actually covers.
How do you check that a supplement is NSF Certified for Sport?
Where to search, why the search results are not enough, and which line of the listing to read against the package in your hand. No prices and no store links.
How do you work out what a supplement costs per dose?
Type the price, servings and amount per serving of one package or two. It works out each one's cost per serving and per comparison dose, and which costs less.
Do supplement prices actually change?
We keep every price reading we take: daily where a store can be read automatically, less often where it is read by hand. Which prices have moved since we started, which have not, and by how much.
How many capsules is one serving?
How many pills the label calls one serving, across every capsule, tablet and softgel we have a price for, and what that does to the count on the front of the bottle.
Is Evogen Nutrition third party tested?
Every Evogen Nutrition product we price, checked in NSF’s Certified for Sport database and others: which listing names the exact package sold, with the listing IDs.
Is Sports Research third party tested?
Every Sports Research product we track, checked in the certifier databases: which program lists each one, and which no database we searched lists.
About these numbers
What “per dose” means here: 5g L-glutamine
NIH Office of Dietary Supplements notes that an adult takes in about 3 to 6 g of glutamine a day from protein-containing foods. 5 g is a round figure inside that range, chosen so packages of different serving sizes can be priced on one basis. It is a yardstick for comparing prices, not a recommended intake, and it cannot change which product is cheapest: it scales every row by the same number. Packages are ranked one format at a time and never across formats. Adopted on October 30, 2026, when the category was built.
Compared on the grams of L-glutamine the Supplement Facts panel prints, never on a scoop or capsule weight. N-acetyl L-glutamine and glutamine peptides are different compounds and are not entered here, and neither are formulas sold for another purpose in which glutamine is one ingredient among several. A glutamine product whose panel also prints a second dietary ingredient with its own amount is entered and marked, as elsewhere on this site.
Where the data comes from
Every claim links to its source. Products, prices and certification listings are read from the retailers' own stores and the certifiers' own databases, and each figure links to the record it came from, so you can check any of them.
- Where a servings-per-container figure was not read from the package's own panel, the product page says how it was worked out.
- Amazon and Walmart are not included, so “cheapest” means cheapest among the retailers we track.
- Prices go stale. Each product page shows when its price was last checked, and a price older than the retailer allows us to cache is marked as a last known price wherever it appears.
- iHerb prices cannot be refreshed automatically. iHerb has not given us access to its price data, so those prices are marked stale until they are re-read. Each retailer offer carries its own check date.
Found something wrong? Tell us. Corrections are the point.
How we make money
No Buy button on this page earns us anything. Where a link elsewhere on the site can, it says so beside the link.
Commission will play no part in what we list, how it ranks, or which link we send you to. The Buy button points at the lowest price we have recorded even when that retailer pays us nothing.