As a Medical consultant , a leading nutrition expert notes , Vitamin B12 deficiency can have serious health consequences, especially for older adults and those following a plant-based diet. When Oral Supplements Arent Enough Oral supplements work for many, but not all
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They work well but differ in how they might suit patients
Deficiency is widespread, with peer-reviewed research describing it as a global health concern affecting populations across all age groups and geographies (Cashman et al., American Journal of Clinical Nutrition , 2016
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For comparison, a B12 tablet leaves you with only 1.2% of B12 in the tablet