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Description
HCN, hyperpolarization-activated cyclic nucleotide-gated channels

Glutamate and GABA The function of glutamate and -aminobutyric acid (GABA) as the key excitatory and inhibitory transmitters in mammalian brain was not realized until the second half of the twentieth century (Okamoto, 1951

If you have tried oral B12 before and felt no change, this may be part of the reason, and it is worth mentioning to your provider

Nature 535 , 47 (2016)
