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How B12 Injections Work Unlike oral supplements, B12 injections deliver the vitamin directly into the bloodstream, bypassing the digestive system and ensuring better absorption

To get started, we recommend scheduling a free phone consultation to discuss your goals and answer any questions

10.1089/acm.2006.12.881 Summary Keywords vitamin B12, efficacy, bioavailability, therapeutic approaches, meta-analysis, cobalamin Citation Mazur M, Ndokaj A, Salerno C, Vallone J, Ardan R, Bietolini S, Carrouel F, Wilk A, Sarig R, Ottolenghi L and Bourgeois D (2025) Efficacy of sublingual and oral vitamin B12 versus intramuscular administration: insights from a systematic review and meta-analysis

Where appropriate vitamin B12 will be supplied, but because of the current situation it may be that the interval needs to be extended, bearing in mind that the virus is spreading so quickly and front-line medical staff have to be protected

It can feel alarming, but doctors say that's often part of the process as weaker hairs fall out to make room for new growth

How Vitamin B12 Shots work