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Patients seek treatment for medically-confirmed B12 deficiency causing fatigue, neurological symptoms, or anemia

R.Adamiec-OrganiciokM.MatysiakN.KaniaD.et al (2025)

Generally, its difficult to say precisely how long a vitamin B12 shot lasts in the body

The shelf life of supplements varies based on type, formulation, storage, and packaging, but most have an expiration date indicating expected potency and safety

Frequently Asked Questions How does Methylcobalamin B12 work

Vitamin B12 is primarily found in: Meats Seafood Dairy products Nutritional yeast Cobalamin is also found in products fortified with vitamin B12, such as breakfast cereals