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Description
It is possible to buy a private vitamin B12 self-test, which will either be in the form of blood being taken by a professional or as finger-prick blood sample to do yourself via post

The information presented here is not intended as medical advice, diagnosis, or treatment recommendations

Houston's built environment compounds the problem in ways I see constantly

But some people do need it, and I won't pretend otherwise

The answer seems like it should be simple, a straightforward binary choice