The NHS advises that taking up to 2mg (2000 micrograms) daily of vitamin B12 supplements is unlikely to cause harm, with no established upper limit in the UK
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Therapeutic response to cyanocobalamin may decrease due to elderly age, infection, renal insufficiency, diabetes mellitus, marrow suppressants use (e.g
If given IV, it must be injected slowly (often over at least 5 minutes or diluted in a larger volume bag and infused)
Instead, youll need to withdraw the needle, safely dispose of the syringe and medication, and start the process over with fresh supplies in a new location
If you're experiencing symptoms of deficiency, follow a plant-based diet, are over 50, or take medications that interfere with B12, annual testing is a good idea