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They are particularly useful for individuals who have difficulty absorbing B12 from food, such as those with certain digestive issues, older adults, vegans, and vegetarians

Any specific combined study design falls outside the scope of general educational content and should be evaluated independently based on individual research protocols
Weng T-C, Chang C-H, Dong Y-H, Chang Y-C, Chuang L-M

These figures are based on preventing B12 deficiency and therefore may not represent the optimum intake
