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Since vitamin B12 is found in animal products (meat and dairy), vegans and vegetarians may have a deficiency
While this medicine is generally well-tolerated, some people may experience mild side effects like pain or redness at the injection site, mild diarrhoea, or a temporary skin rash
For instance, one small study demonstrated that individuals with premature hair graying had lower vitamin B12, folate, and biotin levels than control subjects without premature gray hair (13)
Individuals with certain allergies, liver conditions, or kidney disease, or those who are pregnant or nursing, should consult a physician before starting any injection protocol
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