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10.1186/s13195-017-0323-1 Alzheimers Res

In animal models, L-theanine appears to have a dose-dependent biphasic effect on NSAID-induced gastric ulcers, delaying healing at higher doses (40 mg/kg), but accelerating healing at lower doses (10 mg/kg) perhaps through the maintenance of glutathione levels thus protecting against oxidative damage (26)

Developmental cell

Its best to avoid combining it with strong actives like Vitamin C or retinol in the same routine to prevent reduced effectiveness
