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The standard answer is 2830 days, refrigerated at 28C

Food and Drug Administration) Dietary deficiency of vitamin B 12 occurring in strict vegetarians and in their breastfed infants (isolated vitamin B 12 deficiency is very rare) Malabsorption of vitamin B 12 resulting from damage to the stomach, where intrinsic factor is secreted, or damage to the ileum, where intrinsic factor facilitates vitamin B 12 absorption

It helps in skin cleansing and rejuvenation

A., Alimova, I

If you (or your older relative) has difficulty taking medications regularly, scheduled vitamin B12 shots are often the better option

JAMA Psychiatry 75 , 336346 (2018)