Leber's disease, a hereditary eye disease: Do not take vitamin B12 if you have this disease.It can seriously harm the optic nerve, which might lead to blindness.Breast-feeding women should take no more than 2.8 mcg per day. This combination may increase the risk of blood vessel narrowing.Allergy or sensitivity to cobalt or cobalamin: Do not use vitamin B12 if you have this condition.Pregnancy and breast-feeding: Vitamin B12 is LIKELY SAFE for pregnant or breast-feeding women when taken by mouth in the amounts recommended.The recommended amount for pregnant women is 2.6 mcg per day. Post-surgical stent placement: Avoid using a combination of vitamin B12, folate, and vitamin B6 after receiving a coronary stent.Also, a vitamin B12 nasal gel is applied for pernicious anemia and preventing and treating vitamin B12 deficiency.Vitamin B12 is injected into the body to prevent and treat vitamin B12 deficiency.
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