how long is b12 injection safe after it's drawn up Do Shots Expire or Go Bad? Shelf Life & Storage · PA Relief Do Vitamin B12 Shots Need
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In the old days the Schillings test helped to solve this question

The outer abdomen, particularly the lower quadrants, contains substantial fat even in relatively lean individuals

As the body ramps up red blood cell production in response to B12, potassium can be used up, so your provider may recommend monitoring it with a blood test