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In rarer cases, vitamin B12 can cause more serious side effects such as an irregular heartbeat or heart palpitations, hives, and anaphylaxis

Adverse Effects and Reporting Adverse events or suspected contamination issues should be reported immediately to the manufacturer (Hospira/Pfizer) and relevant regulatory authorities (FDA MedWatch, poison control, or institutional pharmacovigilance systems)

If you have a vitamin B12 deficiency, you may feel tired all the time due to B12 deficiency anemia

10 mL bacteriostatic water same-day ship For research and laboratory use only Not for human or veterinary use

Intramuscular B12 injections, rather than oral B12 supplements, help correct the deficiency

This includes certain genetic disorders, dietary restrictions, or specific medical treatments