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While most patients tolerate B12 shots well, mild side effects can occasionally occur, including minor pain or redness at the injection site, mild diarrhoea, or, in rare instances, an allergic reaction
Given this, the length of the needle is somewhat optional
How long do B12 injections take to work
Vitamin B12 injections can be given in three ways: into the muscle (intramuscular), under the skin (subcutaneous), or through a vein (intravenous)
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