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Oral vitamin B12 supplements have several advantages over injections: They are more cost-effective They are more convenient, as they do not require a visit to a healthcare facility or a home visit from a healthcare professional for administration The risk of an allergic reaction is typically lower with oral supplements than with injections
The wide deficiency prevalence range reported among vegans 5 to 52% in a 2024 Proceedings of the Nutrition Society study reflects the dramatic difference between those who supplement consistently and those who do not
Alternate injection sites include the outer thigh or upper arm fatty tissue if rotating sites to prevent lipohypertrophy (tissue buildup from repeated injections)
That process can break down for reasons that have nothing to do with how much you take
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