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These findings align with global analyses from Europe, North America, and Asia reporting similar population-level increases in vitamin B12 deficiency, where prevalence ranges from 5 to 20% depending on age, diet, and socioeconomic status

What Are Peptides and Polypeptides: Simple Research Definitions Oligopeptides contain fewer than 20 amino acids, though some sources define this category as having between two and 20 residues

Sitaula S, et al

However, there are currently few studies on the relationship between B vitamins and breast cancer, and the role of B vitamins in the occurrence and development of breast cancer is still inconclusive

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