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Consult a healthcare provider if: You may not realize it, but vitamin B12 can be found in some of your favorite foods
Clinical guidance for intramuscular injections points to a 22 to 25 gauge needle, given at a 90-degree angle, with the length chosen so it reaches muscle without going too deep
One such piece of research is a 2020 review published in the journal Nutrients (1)
In all, in 17 patients injection frequency changed between the two surveys
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