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We rely on obtaining it through our diet, primarily from animal products

However, these are typically associated with long-term mega-doses far exceeding whats in your weekly shot

[153] There is evidence that for elderly people, physicians often repeatedly prescribe and administer cyanocobalamin injections inappropriately, evidenced by the majority of subjects in one large study either having had normal serum concentrations or having not been tested before the injections

If you're in Columbia and considering this route, do it with your eyes open

Not evaluated or approved by the FDA

Mild Nausea or Diarrhea Some people report feeling nauseous or having mild diarrhea after getting B12 injections