Common experiences include no noticeable side effects at standard doses (250-500mcg for injectable, 500mcg for oral)

Check with your doctor or nurse immediately if any of the following side effects occur: More common Black, tarry stools bleeding gums chest pain chills cough fever loss of coordination lower back or side pain painful or difficult urination pains in the chest, groin, or legs, especially calves of the legs pale skin pinpoint red spots on the skin severe headaches of sudden onset sore throat sudden onset of slurred speech sudden vision changes swollen glands trouble breathing ulcers, sores, or white spots in the mouth unusual bleeding or bruising unusual tiredness or weakness Less common Bloody urine or bloody stools chest tightness decreased frequency or amount of urine fainting or loss of consciousness fast or irregular breathing increased blood pressure increased thirst itching, skin rash loss of appetite nausea swelling of the eyes, eyelids, face, fingers, or lower legs vomiting weight gain Incidence not known Blistering, peeling, or loosening of the skin joint or muscle pain pain and redness of the skin in the area of earlier radiation treatment red skin lesions, often with a purple center red, irritated eyes stomach cramps, tenderness, or pain watery diarrhea Some side effects may occur that usually do not need medical attention

Dietary factors also influence B12 requirements
caliciviris is tougher, lasting up to 30 days
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When will I feel the effects of a B12 shot