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The short answer is: it depends on where you go

It's obviously not practical to wash your hair every night, so just rinse your scalp if you can and towel it dry

For a detailed breakdown, the National Institutes of Health provides a great list of B12-rich foods that can help you make informed choices at the grocery store

When levels remain persistently elevated particularly without supplement use further assessment may be recommended to look for an underlying cause

Several cells appear to have the greatest demand for cyanocobalamin, particularly those that undergo rapid division such as bone marrow and epithelial cells.[5][7] Cyanocobalamin binds itself to plasma proteins in the systemic circulation