Klaire Labs/SFI Health

L-Glutamine Powder, 351 g

Klaire Labs L-Glutamine Powder delivers free-form L-glutamine, the most abundant amino acid in the body, in an unflavored, highly soluble powder format.

4.6 across 1 sources

May be a fit for

  • Adults seeking L-glutamine to support intestinal lining integrity
  • Practitioners protocols requiring free-form L-glutamine powder for dosing flexibility
  • Individuals supporting muscle recovery with unflavored L-glutamine post-exercise
$50.99

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PowderFormat
351 gPack size
The essentials

A closer look.

Klaire Labs L-Glutamine Powder delivers free-form L-glutamine, the most abundant amino acid in the body, in an unflavored, highly soluble powder format. It supports intestinal barrier integrity, immune function, and nitrogen balance, making it a practical option for individuals focused on gut health, recovery, or periods of physical or metabolic stress.

Why It's Worth Considering: Klaire Labs is a practitioner-trusted brand with a strong record in hypoallergenic formulation; this powder is free of common excipients and fillers, allowing flexible dosing without unnecessary additives.

The Apotheca perspective

50+ signals. A clearer standard.

Our curation and trust scoring bring together manufacturing, testing, research, practitioner insight and reviews from across the web.

92OUT OF 100
Manufacturing9595
Lab verification8383
Transparency7070

Our score is an editorial assessment, not a product certification or a guarantee of results.

Inside the formula

Product details

Who it may suit

May be a fit for

  • Adults seeking L-glutamine to support intestinal lining integrity
  • Practitioners protocols requiring free-form L-glutamine powder for dosing flexibility
  • Individuals supporting muscle recovery with unflavored L-glutamine post-exercise
  • Those seeking L-glutamine to help maintain healthy gut barrier function

Considerations

  • Known allergy to any ingredient (check label)
  • Currently pregnant or breastfeeding (consult healthcare provider)
  • Taking prescription medications (check for interactions)
  • Under 18 years of age (unless recommended by pediatrician)
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From across the web

Real reviews. A wider perspective.

Customer reviews, social conversations and expert insights, with every source in view.

4.6/5Aggregate source rating
Marketplaces & brand websites
Amazon, iHerb and direct brand reviews
Social & community
Reddit, X, Instagram and TikTok
Video & creators
YouTube and creator perspectives

Coverage varies by product and brand.

108 product and brand ratings and mentions across 1 sources.

Good to know

A few useful answers.

Research & further reading

More category questions

How should I store this supplement?

Store in a cool, dry place away from direct sunlight. Most supplements are stable at room temperature (59-77°F). Keep the bottle sealed between uses. Check the label for any specific storage requirements — some probiotics and oils require refrigeration.

Can I take this with other supplements?

Most supplements can be taken together safely. However, some minerals compete for absorption (zinc and iron, calcium and magnesium) and should be taken at different times of day. If you're taking prescription medications, consult your healthcare provider about potential interactions.

How long should I take this supplement?

Most supplements benefit from consistent daily use over 2-3 months to achieve full effect. Some (like vitamins and minerals) can be taken indefinitely as part of a daily routine. Others (like specific herbs) may benefit from cycling. Follow the product's recommended protocol or consult a practitioner.

When is the best time to take this?

Fat-soluble supplements (vitamins A, D, E, K, omega-3, CoQ10) should be taken with a meal containing fat. Water-soluble supplements (B vitamins, vitamin C) can be taken anytime. Minerals are generally best absorbed with food. Probiotics should be taken with or just before a meal. Check the product label for specific timing recommendations.

How do I know if this supplement is working?

Track your specific health goals — energy levels, sleep quality, joint comfort, digestion, mood, etc. Most supplements take 2-8 weeks for noticeable effects. For objective measurement, baseline lab tests before starting (and repeat at 3 months) provide definitive evidence. The Gabriel Score incorporates clinical evidence for expected outcomes.

Supplement information is provided for education and is not a substitute for personalized medical advice. Supplements are not intended to diagnose, treat, cure or prevent disease. Read the current product label before use.

Klaire Labs/SFI Health - L-Glutamine Powder, 351 g Klaire Labs/SFI Health

Apotheca quality score

92/100

The overall score combines several sources of information. The individual dimensions below show where those signals are stronger or more limited; they are not a simple average of the overall score.

Manufacturing9595
Lab verification8383
Review consensus96.196.1
Practitioner signals5050
Community signals5757
Transparency7070
See available brand signals
✓
Third-party lab tested (heavy metals, contaminants)Pass
✓
GMP-certified manufacturing by Klaire Labs/SFI HealthCertified
✓
Quality ingredients with verified sourcingGood
✓
Clean FDA regulatory recordNo issues
✓
Positive consumer reviews and community feedbackGood
✓
Authorized distribution channel verifiedDirect

Our score is an editorial assessment, not a product certification or a guarantee of results.

How our scoring works ↗