how long does b12 injection last Injections: Who Should Get Them and Do They Last? How Long Does a B12

Cell 184 , 35023518.e33 (2021)

Typically, B12 can be administered either intramuscularly or subcutaneously

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A meta-analysis of four observational studies, following a total of 7,475 older individuals for 3 to 16 years, found a weak association between an elevation in vitamin B 12 of 50 pmol/L in blood and a reduction in fracture risk (114)

Tablets just as effective Over-the-counter B12 tablets are a fraction of the cost of shots, and have been shown in a British-Canadian study to work just as well for most people, although some people with digestive conditions may have difficulty absorbing the vitamin in tablet form