do you have to be certified to give b12 injections Vitamin Injection Sites: All Need Know The Truth About B12 Injections:
Description
It is important not to self-treat with high-dose B12 supplements before seeing your GP if you suspect deficiency, as this can interfere with diagnostic blood tests and potentially mask underlying conditions such as pernicious anaemia

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What if I want to change my dose

[PubMed] [Google Scholar] 14.Gutteridge JM, Wright EB
