Head-to-head evidence comparison — which supplement is right for you?
L-Glutamine and Probiotics are closely matched across evidence, studies, and safety.
5-10g
Post-workout, Before bed, Or split throughout day
L-Glutamine powder
10-20 billion CFU
With or without food (strain-dependent), Same time daily for consistency
Capsules with multiple strains
Enhanced gut barrier function and microbiome health
TAKE TOGETHER for comprehensive gut support.
2-4 weeks
2-4 weeks
1-2 weeks
2-4 weeks
4-8 weeks
4-8 weeks
First 1-2 weeks
Multi-cohort analysis of depression-associated gut bacteria sheds insight on bacterial biomarkers across populations
Cellular and molecular life sciences : CMLS (2022) · Meta analysis · n=1827
By contrast, elevated L-glutamine degradation, and reduced L-glutamate and L-isoleucine biosynthesis were identified in depressive-associated microbiomes.
Metabolomics in Diabetic Retinopathy: A Systematic Review
Investigative ophthalmology & visual science (2021) · Systematic review
This review summarizes potential biomarkers and metabolic pathways, providing insights into new pathogenic pathways for this microvascular complication of diabetes.
L-glutamine supplementation in critically ill patients: A systematic review and meta-analysis
Critical Care Medicine (2020) · Meta analysis · n=4671
Parenteral glutamine reduced infectious complications in ICU patients
Preventive Effect of Probiotics on Oral Mucositis Induced by Cancer Treatment: A Systematic Review and Meta-Analysis
International journal of molecular sciences (2022) · Meta analysis · n=708
Three trials using Lactobacilli-based probiotics reported that the incidence of oral mucositis in the probiotic group was significantly low (risk ratio [RR] = 0.84, 95% confidence interval [CI] = 0.77−0.93, p = 0.0004).
Probiotics for treating acute infectious diarrhoea
The Cochrane database of systematic reviews (2020) · Meta analysis · n=12127
Effect size was similar in the sensitivity analysis and marked heterogeneity persisted.
Probiotics to prevent infantile colic
The Cochrane database of systematic reviews (2019) · Meta analysis · n=1886
There is no clear evidence that probiotics are more effective than placebo at preventing infantile colic; however, daily crying time appeared to reduce with probiotic use compared to placebo.
Both L-Glutamine and Probiotics are closely matched — the best choice depends on your specific health goals.
For reduce inflammation, Probiotics has a higher relevance score (95 vs 85).
L-Glutamine and Probiotics may work well together: Enhanced gut barrier function and microbiome health TAKE TOGETHER for comprehensive gut support.