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Description
Some providers apply a topical numbing spray (ethyl chloride or vapocoolant) to reduce the initial needle stick sensation, though this is optional since the discomfort from the insertion is brief

A similar study showed that inadequate sleep after an influenza vaccine also resulted in an inadequate immune response

Your body uses vitamin B12 more efficiently when you consume folate (vitamin B9) and iron together

doi: 10.1124/jpet.116.239509 57
