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Description
Maintenance phase

Vitamin B12 exists in various chemical forms, and apart from hydroxocobalamin, three other essential types of vitamin B12 are commonly known: Methylcobalamin

a mass in the neck, dysphagia, dyspnea or persistent hoarseness)

Most people obtain adequate B12 through diet (meat, fish, dairy, and eggs)
The practice is exceptional

10.1016/j.neuron.2015.05.046 Neuron 19 KatzP
