A purine derivative, paraxanthine, promotes cysteine uptake for glutathione synthesis ScienceDirect 1 Methylxanthine enhances memory and neurotransmitter levels PLOS One A purine derivative, paraxanthine, promotes cysteine uptake for glutathione synthesis ScienceDirect Paraxanthine enhances memory and neuroplasticity more than caffeine in rats Experimental Brain Research Springer Nature Link
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