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Description
Generally, the effects of a B12 injection start to wane after a week

Unlike some vitamins, B12 is absorbed through the digestive system, which means some people struggle to absorb enough from food alone
Switching up where you inject helps spread out the medicine

However, surprisingly there were no differences in serum B12 levels between Asian and White individuals for most age groups in these UK adults

Funding This work was supported by Health Commission of Anhui Province (AHWJ2021b111), Health Commission of Fuyang City (2021-1), and Anhui Medical University Fund Project (2021xkj210)

Performance of the serum cobalamin assay for diagnosis of cobalamin deficiency
