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Neuropsychiatric symptoms such as depression, irritability, and personality changes may also occur

Benefits of Vitamin B12 Injections One of the most efficient ways to ensure optimal Vitamin B12 levels is through injections

Drawing blood technology and disease identity in twentieth-century America (Johns Hopkins Paperbacks ed.)

Toxicon 190:S64S65

Vitamin B12 Regulates Cytokines and Neurotrophic Factors A very new research field has brought to light astonishing new functions of B12 in the nervous system, which go far beyond its role as coenzyme and rather resemble the mode of action of a hormone: vitamin B12 regulates the level of certain neurotrophic factors such as neurotransmitters, growth factors and the so-called cytokines essential messenger substances that all assume a controlling function in numerous bodily processes (32)