Patients taking certain medications (e.g., chloramphenicol may reduce the effectiveness of B12 therapy) or with risk factors for B12 deficiency (metformin use, proton pump inhibitors, nitrous oxide exposure, vegan diet) should discuss these with their healthcare provider
[DOI] [PMC free article] [PubMed] [Google Scholar] 29.Stanley TL, Feldpausch MN, Oh J, et al
If you have symptoms of deficiency that have never been investigated, see your GP for a blood test before booking any injection
To convert either of these into a per-user schedule and cost, use the dosage calculator
In some cases, you may be able to get adequate Vitamin B12 by making slight adjustments to your daily diet
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