Best for Digestion
Best Glutamine for Digestion
Top 5 products ranked · Reviewed May 2026 · 5000–15000 mg clinical dose
Why Glutamine for Digestion
Glutamine plays a supporting role in digestion. Conditionally essential amino acid and the primary fuel source for enterocytes and immune cells. Well studied for gut barrier integrity, immune support in athletes and stressed individuals, and exercise recovery.
What dose to look for
Clinical studies typically use 5000–15000 mg of glutamine. RCTs for gut barrier integrity and immune support use 5–15 g/day. Doses up to 30 g/day have been used in clinical settings. Products below this range may not deliver meaningful results.
What the research says
Glutamine has moderate clinical evidence for digestion benefits. Multiple trials for gut barrier integrity and immune support, especially in stressed populations Learn more
Clinical research on L-Glutamine
MODERATE — RCTs for gut permeability and IBS; primary fuel for enterocytes · 5,000–15,000 mg/day
- •2019 RCT (106 IBS-D patients with increased intestinal permeability) found L-glutamine 5g 3x/day for 8 weeks significantly reduced IBS symptom severity and normalized gut permeability. PubMed
- •Glutamine is the primary metabolic fuel for enterocytes (intestinal epithelial cells) and colonocytes. During critical illness or intense exercise, demand exceeds endogenous production.
- •2014 meta-analysis in surgical/critical care patients found glutamine supplementation reduced infectious complications and length of hospital stay. However, the REDOXS trial (2013) found potential harm in critically ill patients with multi-organ failure.
- •For gut-focused use (IBS, leaky gut), 5–15g/day is standard. Well-tolerated. Most abundant amino acid in the body — supplementation restores depleted pools during GI stress rather than providing a novel therapeutic effect.