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For this piece, beauty writer Carol Lee spoke with trusted skin experts about Korean vitamin C serums
Learn where to self-administer a B12 shot and how to do it painlessly This article was medically reviewed by Shari Forschen, NP, MA and by wikiHow staff writer, Amber Crain
Remove the needle and apply gentle pressure without rubbing
Frozen storage ( 20 C, and preferably lower for long-term): Recommended for extended timelines, with vials kept well sealed to limit moisture uptake and oxidative degradation
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