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2006;291:R15271532

Follow with a hydrating serum if desired, then moisturizer, then sunscreen

B12 deficiency becomes increasingly common with age due to atrophic gastritis, reduced intrinsic factor production, and polypharmacy
Bill 96372

doi: 10.1016/s0167-4781(00)00238-4

[DOI] [PMC free article] [PubMed] [Google Scholar] 2.Howell A
