paraxanthine increases glutathione catalase outperforms caffeine as a cognitive enhancer in new preclinical study Catalase, superoxide dismutase and ascorbate-glutathione

10.3390/ijerph17186686 31

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Some of the best products are serum, creams and masks with Glutathione as the star ingredient

May delay oral drug absorption

L-theanine (usually ~200 mg) seems to smooth out caffeines stimulant effect, resulting in better focus and less distractibility than caffeine alone

These cytokines are known to regulate the production of IL-22, which ultimately promotes tumor initiation and growth by activating the epithelial signaling transducer and activator of transcription 3 [34, 35]