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[DOI] [PMC free article] [PubMed] [Google Scholar] 18.Beretta G, Artali R, Regazzoni L, et al

For dietary intervention studies, sample sizes ranged from 15 to 85 participants, with intervention durations from 5 months to 4 years

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Estimates suggest that about one in four older adults in developed countries may have suboptimal B12 levels, highlighting the need for improved detection and intervention

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