what happens if you refrigerate b12 injections inject expired Do B12 Need to Be Refrigerated: 6 Cool B12 Injections - Fort Myers,
Description
Once supplementation stops, B12 levels typically return to the normal range within a few months

Ethnicity influences total serum vitamin B12 concentration: A study of Black, Asian and White patients in a primary care setting

Its also possible to feel no obvious sensation at the time of injection, apart from maybe a warmth if given IV

Mayo Clinic notes that there is no solid proof B12 injections help with weight loss in people who are not deficient
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Lee, Kim et al