SuppRankedTop 10 l-glutamine brands on Amazon (estimated revenue)
Ranked by estimated monthly revenue from Amazon's L-Glutamine Best Sellers top 100. Updated October 15, 2026.
Nutricost is the top-selling l-glutamine brand on Amazon by estimated revenue, at about $1.5M/mo from 4 products in the L-Glutamine Best Sellers top 100. That is about 37% more than #2 THORNE (~$1.1M/mo). The list is fragmented: the top 3 brands take about 32% of its estimated sales and the top 10 about 56%, spread across 63 brands in total. All figures are modeled estimates, not Amazon data.
| # | Brand | Est. revenue/mo |
|---|---|---|
| 1 | Nutricost13% share · best #1 | $1.5M |
| 2 | THORNE10% share · best #7 | $1.1M |
| 3 | Pure Encapsulations9% share · best #4 | $1.1M |
| 4 | NOW Foods5% share · best #3 | $535K |
| 5 | BulkSupplements4% share · best #6 | $454K |
| 6 | Metagenics3% share · best #30 | $387K |
| 7 | Optimum Nutrition3% share · best #12 | $385K |
| 8 | Toniiq3% share · best #17 | $369K |
| 9 | Healios3% share · best #35 | $344K |
| 10 | Stomach Soothe3% share · best #46 | $331K |
The top 10, brand by brand
1. Nutricost
~$1.5M/mo est. revenue (13% of this list) and ~69.8K units/mo from 4 products; best position #1. Its highest-ranked product here is Nutricost L-Glutamine Powder (500 Grams) Unflavored, 100 Servings, GMO-Free… at #1. Overall it ranks #2 of 3,479 brands.
2. THORNE
~$1.1M/mo est. revenue (10% of this list) and ~23.8K units/mo from 2 products; best position #7. Its highest-ranked product here is THORNE L-Glutamine Powder, Amino Acid Supplement, 90 Servings | Supports Immune… at #7. Overall it ranks #8 of 3,479 brands.
3. Pure Encapsulations
~$1.1M/mo est. revenue (9% of this list) and ~32.6K units/mo from 4 products; best position #4. Its highest-ranked product here is Pure Encapsulations L-Glutamine 500 mg, 90 Capsules | Supplement for Immune and… at #4. Overall it ranks #3 of 3,479 brands.
4. NOW Foods
~$535K/mo est. revenue (5% of this list) and ~41.6K units/mo from 4 products; best position #3. Its highest-ranked product here is NOW Supplements, L-Glutamine 500 mg, Amino Acid, 120 Veg Caps at #3. Overall it ranks #1 of 3,479 brands.
5. BulkSupplements
~$454K/mo est. revenue (4% of this list) and ~18K units/mo from 2 products; best position #6. Its highest-ranked product here is BulkSupplements.com L-Glutamine Powder - 500g (Pack of 1) | L-Glutamine: Gluten… at #6. Overall it ranks #9 of 3,479 brands.
6. Metagenics
~$387K/mo est. revenue (3% of this list) and ~4.5K units/mo from 1 product; best position #30. Its highest-ranked product here is Metagenics Glutagenics L-Glutamine & DGL Gut Health Powder, 60 Servings… at #30. Overall it ranks #69 of 3,479 brands.
7. Optimum Nutrition
~$385K/mo est. revenue (3% of this list) and ~12.4K units/mo from 2 products; best position #12. Its highest-ranked product here is Optimum Nutrition L-Glutamine Muscle Recovery Capsules, 240 Ct | Glutamine… at #12. Overall it ranks #28 of 3,479 brands.
8. Toniiq
~$369K/mo est. revenue (3% of this list) and ~6.7K units/mo from 1 product; best position #17. Its highest-ranked product here is Toniiq NSF Certified Ultra High Strength Glutathione Capsules - 1000mg… at #17. Overall it ranks #77 of 3,479 brands.
9. Healios
~$344K/mo est. revenue (3% of this list) and ~4K units/mo from 1 product; best position #35. Its highest-ranked product here is Healios Grape Flavor Oral Health and Dietary Supplement, 11.64 oz | Powder… at #35. Overall it ranks #1924 of 3,479 brands.
10. Stomach Soothe
~$331K/mo est. revenue (3% of this list) and ~3.3K units/mo from 1 product; best position #46. Its highest-ranked product here is Stomach Soothe Soothe Naturals Acid Reflux Powder (90 Servings) | Natural… at #46. Overall it ranks #2205 of 3,479 brands.
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Full L-Glutamine ranking
All 63 brands in the list, ordered by rank strength, plus the top 10 products.
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