Talk to your doctor before starting if you: Are allergic to B12 Have optic nerve issues (optic atrophy) Have blood in urine or polycythemia Are pregnant, breastfeeding, or trying to conceive Have low iron or folate, or an active infection Dosage, Concentration, Route of Administration Dosage: Always follow the guidance of a licensed medical provider for the correct dosage
Rare side effects include mild irritation at the injection site or allergic reactions
Right-upper-abdominal pain, fever, vomiting, or jaundice usually requires medical evaluation and often ultrasound or other imaging
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Despite all the above, cyano B12 is the most prescribed form