Pure L-Glutamine Powder, 10.6 oz (300 g)
Scored by the Formulate Research Team · Last reviewed July 2026
Score Breakdown
Three factors carry this score; three more are checked separately and can only take points away. Hover or tap to see what drove each one.
Ingredients per Serving
Certifications & Testing
Other Ingredients
None
Recommended Use
Suggested Adult Use: Add 1 scoop to 8 ounces of juice or protein shake and mix well. For best results, drink 1 hour before exercise. Repeat after exercise or before bedtime, or as recommended by a nutritionally informed physician. It is recommended to supplement with B vitamins if taking L-glutamine long term.
Warnings
Warning: Avoid using if you are pregnant, nursing or if you have liver problems. If you are sensitive to monosodium glutamate (MSG), you may be sensitive to glutamine as the body converts glutamine to glutamate.
Frequently Asked Questions
What is Doctor's Best Pure L-Glutamine Powder, 10.6 oz (300 g)'s Formulate score?
Doctor's Best Pure L-Glutamine Powder, 10.6 oz (300 g) scores 92 out of 100 (grade A) on Formulate's ingredient-level rubric: clinical evidence, dose accuracy and bioavailability carry the score, while manufacturing, transparency and safety are checked separately and can only deduct.
Is Doctor's Best Pure L-Glutamine Powder, 10.6 oz (300 g) worth it?
Doctor's Best Pure L-Glutamine Powder, 10.6 oz (300 g) scores 92/100 (grade A). That puts it in Formulate's top tier: its ingredient doses, forms, and label transparency hold up against the clinical evidence, and it carries credible third-party testing. Formulate grades every product with the same automated rubric, so the score reflects the formula — not marketing or sponsorships.
What's in Doctor's Best Pure L-Glutamine Powder, 10.6 oz (300 g)?
Each serving contains L-Glutamine (5 g). Serving size: 5 Gram(s). 60 servings per container.
How do I take pure l-glutamine powder, 10.6 oz (300 g)?
Suggested Adult Use: Add 1 scoop to 8 ounces of juice or protein shake and mix well. For best results, drink 1 hour before exercise. Repeat after exercise or before bedtime, or as recommended by a nutritionally informed physician. It is recommended to supplement with B vitamins if taking L-glutamine long term.
Who makes Pure L-Glutamine Powder, 10.6 oz (300 g)?
Pure L-Glutamine Powder, 10.6 oz (300 g) is made by Doctor's Best. See Formulate's full grade and product lineup for Doctor's Best on its brand page.
Is Doctor's Best Pure L-Glutamine Powder, 10.6 oz (300 g) third-party tested?
Doctor's Best lists the following certifications and testing for this product: Non-GMO, Gluten-Free, Vegan, Vegetarian, Dairy-Free.
Related Supplements
Track pure l-glutamine powder, 10.6 oz (300 g) in your stack
Build a personalized supplement stack free in your browser — no install. Flag dose overlaps and interactions, and keep every product scored against the latest evidence.
Is Pure L-Glutamine Powder, 10.6 oz (300 g) right for your goals?
Two questions, then every ingredient graded against what you're actually trying to do — plus what it costs per effective dose.
Build my stack2 questions · free · no account needed to start
Also on iPhone — get the free app
Evidence-based supplement guides, no spam
We send a short digest when new guides drop — nothing else. No affiliate pushes, no sponsored content, unsubscribe anytime.
Disclosure. Formulate may earn a commission from purchases made through links on this page. Commissions never influence scores — every product is graded by the same automated rubric. This page is for educational purposes only and does not replace advice from a qualified healthcare provider.