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The frequency of injections depends on individual needs and medical advice, but many people receive injections once a week if they are deficient
published from January 1, 2010, to July 1, 2018
Also, people with diabetes who take a medication called metformin are at a higher risk of developing B12 deficiency because this medication can reduce B12 absorption
[56] [57] Low levels of serum vitamin B 12 may be caused by other factors than B 12 deficiency, such as folate deficiency, pregnancy, oral contraceptive use, haptocorrin deficiency, and myeloma
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