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Their existence is noted

Nutrients, 11 (12), 3040

Nevertheless, researchers may consider administering the peptide twice daily instead of once daily, considering the short half-life after an infusion

Lymphocyte proliferation modulated by glutamine: involved in the endogenous redox reaction

In studies, L-theanine has shown a great safety profile, with animal studies employing doses that equate to around 50g/day in humans without any side effects.6 Another study, which combined L-theanine or placebo with the anti-anxiety medication fluoxetine, reported only mild drowsiness and occasional GI upset.7 Studies into Suntheanine bear similar results