Natural Factors L-Glutamine 5000

Natural Factors · Powder · 5000 mg

Price/day

€0.46

Dose

5000 mg

Servings/pack

Pack price

€22.90

Transparency Index

6.9/10

Acceptable A reasonable pick for targeted L-glutamine use. Not for the muscle-building marketing angle, but for gut barrier support or high-stress contexts.

Rating breakdown

Evidence for ingredient 6.0/10

L-glutamine is well supported clinically in ICU patients (parenteral). Oral supplementation in healthy athletes shows little convincing benefit in RCTs. Gut barrier and stress context provide moderate-level evidence.

Value for money 7.0/10

€0.46 per day for 5 g powder is fair for plain glutamine powder. No premium markup, solid basic logic.

Product quality 7.0/10

Plain glutamine powder without unnecessary additives. Natural Factors is a reputable Canadian manufacturer with a long track record.

Label honesty 8.0/10

The product is clearly positioned as an amino acid supplement without exaggerated efficacy claims — by no means a given with glutamine products.

Third-party testing 6.0/10

Natural Factors is cGMP-certified, but no especially strong independent testing transparency is visible at the individual product level.

Product Description

Natural Factors delivers a pure L-glutamine powder without unnecessary additives. At 5 g per serving, this matches the dosage used in most human studies.

What We Like

Pure glutamine powder without unnecessary additives
5 g per serving: matches study dosing
Reputable Canadian brand with a long track record
Fair value for money for a powder product

What We’re Missing

Limited evidence for oral use in healthy athletes
Not for blind daily supplementation without a clear indication
No especially strong external testing certification at product level

Usage Recommendation

Most useful in specific contexts: high physiological stress, gut barrier support, recovery, or intense endurance training. Well absorbed on an empty stomach or post-workout.

Ingredient dossier

L-glutamine is the most abundant free amino acid in the body. Clinically well-supported in critical care; evidence for oral supplementation in healthy individuals is more limited.

Read full dossier: L-Glutamine →