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 $421K/mo from 4 products in the L-Glutamine Best Sellers top 100. That is about 41% more than #2 THORNE (~$300K/mo). The list is fairly concentrated: the top 3 brands take about 49% of its estimated sales and the top 10 about 68%, spread across 63 brands in total. All figures are modeled estimates, not Amazon data.
The top 10, brand by brand
1. Nutricost
~$421K/mo est. revenue (21% of this list) and ~19.1K 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
~$300K/mo est. revenue (15% of this list) and ~6K 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 #6 of 3,479 brands.
3. Pure Encapsulations
~$270K/mo est. revenue (13% of this list) and ~7.6K 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 #4 of 3,479 brands.
4. NOW Foods
~$83K/mo est. revenue (4% of this list) and ~7.5K 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. Metagenics
~$73K/mo est. revenue (4% of this list) and ~850 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 #73 of 3,479 brands.
6. Optimum Nutrition
~$55K/mo est. revenue (3% of this list) and ~1.9K 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 #22 of 3,479 brands.
7. BulkSupplements
~$54K/mo est. revenue (3% of this list) and ~2.1K 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 #13 of 3,479 brands.
8. MuscleTech
~$42K/mo est. revenue (2% of this list) and ~2.5K units/mo from 1 product; best position #10. Its highest-ranked product here is MuscleTech 100% L-Glutamine Powder for Enhanced Muscle Recovery, Unflavored… at #10. Overall it ranks #112 of 3,479 brands.
9. Healios
~$41K/mo est. revenue (2% of this list) and ~477 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 #2052 of 3,479 brands.
10. Stomach Soothe
~$39K/mo est. revenue (2% of this list) and ~394 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 #2213 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.
See all L-Glutamine brands →