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FAQ Vitamin B12 Injections: Good or Bad

B-vitamin intake from diet and supplements and breast cancer risk in middle-aged women: results from the prospective NutriNet-Sante cohort

It is safe in most cases, but if a woman has certain health issues, such as an increased risk of clotting, it may not be the right choice

This includes confirmed low serum vitamin B12 levels, pernicious anaemia, malabsorption states such as coeliac disease, inflammatory bowel disease, or post-gastric or bariatric surgery, unexplained anaemia, neuropathy or neurological symptoms consistent with vitamin B12 deficiency, a long-term vegan diet with symptoms or low levels, or failure of oral vitamin B12 supplementation