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C.FriedmanK.SherryJ.BrazzilloK.GenobleL.BhargavaP.et al (2011)
3.3 Changes in serum cobalamin by supplementation route and dosage Across 35 comparisons, the mean percentage increase in serum cobalamin following supplementation was approximately 293%, confirming the overall effectiveness of vitamin B12 interventions (Supplementary Table S4)
The injection itself is usually a quick, minor pinch
The procedure takes only a few minutes, making it one of the fastest clinical options for targeted B12 supplementation
Whilst the NHS notes that taking up to 2,000 micrograms daily is unlikely to cause harm in most people, there is generally no benefit to consuming such excessive amounts unless treating confirmed deficiency under medical supervision
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