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The injectable versus oral peptide comparison provides additional context
Moreover, as expertly reviewed by others [2, 3, 93], astrocytes regulate the synaptic availability of NMDA receptor modulators: (1) kynurenic acid, an antagonist at the glycine binding site of the NMDA receptor, is produced from tryptophan and released by astrocytes
Influence of recent intake: Recent B12-rich meals or injections can temporarily raise serum levels, potentially masking a deficiency
Mitochondrial electron transport chain, ROS generation and uncoupling
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