L-Glutamine

L-Glutamine is a Amino Acid supplement available in 1 form.

Not all forms of L-Glutamine are equal. The form you choose determines how much L-Glutamine actually reaches your tissues, and the difference between the best and worst forms can be substantial. L-glutamine is the most abundant free amino acid in circulation and the primary fuel source for intestinal enterocytes and immune cells. Research supports L-glutamine supplementation for promoting healthy gut mucosal integrity, immune function, and muscle nitrogen balance, particularly during periods of physiological stress.

L-Glutamine Preferred (Preferred Form) has a bioavailability rating of good absorption.

L-Glutamine is the most abundant amino acid in the body and the primary fuel source for enterocytes (gut lining cells) and immune cells. Research supports its use for gut barrier integrity (leaky gut support), immune function during physical stress, and muscle recovery. It is conditionally essential during illness, trauma, or intense exercise.

Plasma L-glutamine significantly elevated (~20%, p=0.046) after oral L-glutamine supplementation; clean absorption study in healthy subjects PMID: 11985937

Research suggests L-glutamine may help support muscle strength recovery and reduce exercise-related muscle soreness. In a double-blind placebo-controlled crossover trial of 16 healthy adults, oral L-glutamine produced faster recovery of knee-extensor peak torque and lower soreness ratings. PMID: 25811544

Research suggests L-glutamine may help support recovery from intense exercise. In a double-blind crossover trial of 12 professional athletes, 6 g/day of oral L-glutamine was associated with lower markers of muscle damage. PMID: 34204359

L-Glutamine is classified as Preferred Form by FormulaForge — our top recommendation for L-Glutamine. It carries a bioavailability rating of good absorption, meaning more of the active compound reaches your tissues per dose unit compared to lower-rated forms.

When choosing a L-Glutamine supplement, read the label for the specific form name — that is what determines how much you actually absorb. Preferred Forms have the strongest research-backed evidence for efficient absorption.

Other forms may be appropriate depending on individual goals, cost considerations, and your healthcare provider’s guidance. The best form for you depends on your specific health needs.

Individual dose requirements vary based on health goals, body weight, and existing nutrient intake. Your healthcare provider can help you determine an appropriate amount of L-Glutamine for you.

Side Effects: Consult your healthcare provider regarding tolerability, particularly at higher doses.

These statements are based on structure/function research and have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease. Always consult a qualified healthcare provider before starting or changing a supplement regimen.

The following studies and findings inform FormulaForge classifications for L-Glutamine:

Plasma L-glutamine significantly elevated (~20%, p=0.046) after oral L-glutamine supplementation; clean absorption study in healthy subjects PMID: 11985937

Research suggests L-glutamine may help support muscle strength recovery and reduce exercise-related muscle soreness. In a double-blind placebo-controlled crossover trial of 16 healthy adults, oral L-glutamine produced faster recovery of knee-extensor peak torque and lower soreness ratings. PMID: 25811544

Research suggests L-glutamine may help support recovery from intense exercise. In a double-blind crossover trial of 12 professional athletes, 6 g/day of oral L-glutamine was associated with lower markers of muscle damage. PMID: 34204359