The Claim
L-glutamine supplementation at 0.3 g/kg body weight per day for three weeks in combat-sport athletes does not significantly alter salivary cortisol concentration, despite improving the testosterone-to-cortisol ratio through preservation of testosterone levels.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
In combat-sport athletes taking 0.3 grams of L-glutamine per kilogram of body weight daily for three weeks, salivary cortisol levels remain unchanged, while the testosterone-to-cortisol ratio increases due to stable testosterone levels.
See the scientific wording
L-glutamine supplementation at 0.3 g/kg body weight per day for three weeks in combat-sport athletes does not significantly alter salivary cortisol concentration, despite improving the testosterone-to-cortisol ratio through preservation of testosterone levels.
L-glutamine strengthens the gut lining, which stops bacterial toxins from entering the bloodstream. This reduces overall body stress, so the stress hormone cortisol doesn’t rise. At the same time, glutamine gives the body the fuel it needs to keep making testosterone, so testosterone levels stay steady. The result is a better balance between testosterone and cortisol without lowering cortisol itself.
What the research says
1 studyL-glutamine didn’t lower cortisol, but it kept testosterone from dropping during tough training, which made the testosterone-to-cortisol ratio better — just like the claim said.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.