Does Glutamine Exercise Performance Randomized Trial work?

The current Migaku evidence database contains 2 reusable source documents for Glutamine Exercise Performance Randomized Trial. This answer focuses on strength of evidence and what the studies can or cannot prove. - For every 1 µg/mL increase in salivary threonine concentration, average running speed increased by 0.011 km/h, and this correlation persisted after adjusting for age and heart rate. [Zhao H (2025); evidence level 3] - Conclusions This study found a positive correlation between salivary threonine and 8 km running speed, along with differences in serine and glutamine concentrations among runners with different speeds. [Zhao H (2025); evidence level 3] - These findings provide preliminary evidence for the relationship between salivary amino acid concentrations and running performance, though further research with larger samples and diverse exercise types is needed. [Zhao H (2025); evidence level 3] - Purpose To explore the potential relationship between salivary amino acid concentrations and 8 km running performance in male undergraduate students. [Zhao H (2025); evidence level 3] - However, current evidence remains insufficient to determine clear supplementation benefits or define an optimal timing strategy. [Djordjevic B (2026); evidence level 4] Evidence levels are sorting aids, not final clinical grades. Level 1 usually indicates systematic-review style evidence, level 2 indicates randomized trials or public-health guidance, and lower levels need more cautious wording. This page is educational. People with medical conditions, pregnancy, medication use, or unusual symptoms should ask a qualified clinician before changing supplements, medication, or treatment routines.