can b12 injection give you diarrhea Injections: Who Should Get Them and How Long Do They Last? Vitamin B12 Side Effects
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Avoid makeup for the first 12 to 24 hours, use gentle skincare, apply sunscreen, and keep your skin hydrated to help it heal well

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An update on vitamin B 12 -related gene polymorphisms and B 12 status Genes Nutr 2018;13:2
