This is where bac water, or bacteriostatic water, comes into play
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After that, take a 4-week break before starting again
This is the most common route for B12 in a clinic, usually into the deltoid muscle of the upper arm
(2017) 356:j831
We are not aware of any movement to make these tests more available even though the NICE Guideline on B12 Deficiency recommended the use of these tests, together with presentation of symptoms, to diagnose B12 deficiency and Pernicious Anaemia