side effects of not having b12 injection Always Tired? Injections Could Help Vitamin B12 deficiency is a
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Shrink fat-cell size adipocytes tend to store less and burn more, trimming hypertrophy (seen in rodent/adipocyte studies)

A 2013 study by Stier et al
It influences serotonin receptor sensitivity and has been researched as a treatment for panic disorder and OCD

Oral contraceptives: may decrease serum vitamin B12 concentrations

Scand J Haematol 1964;1:5-15