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1 2 "Vitamin B-12 Associated Neurological Diseases: Background, Pathophysiology, Epidemiology"
Methionine provides methyl groups for biochemical reactions and supports liver function in processing fatty deposits
difficulty breathing
Longer-Lasting Effects Depending on the dosage, the effects of Vitamin B12 injections can last anywhere from one week to a month, meaning fewer doses are needed to maintain adequate levels
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