The most common side effects are mild and may include pain or redness at the injection site, mild diarrhea, nausea, or a feeling of swelling all over the body
Untreated vitamin B12 deficiency can lead to anemia or irreversible nerve damage
However, megadoses might lead to acne, skin rash or interfere with certain medications
There is no supplement, food, or detox that lowers B12 levels directly
Patients should avoid ingesting large amounts of vitamin C within 1 hour of oral vitamin B12 administration Extended release potassium products Antibiotics such as gentamicin, neomycin, tobramycin Anti-seizure medications such as phenobarbital, phenytoin, primidone Medicines used to treat heartburn like H2 blockers such as cimetidine and proton pump inhibitors such as omeprazole Antacids such as ranitidine, cimetidine Vitamin B12 Injection Storage and Safety Information Vitamin B12 tablets should be in a cool and dry place