How Long Off Vitamin B12 Supplements Before Testing?

I searched the site and found that it is important to not be supplementing B12 before testing, but.... I have been on B12 supplements almost my entire life (I am 50) and so how long should I be off of them before testing?

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What are you testing and why?
by: Kerri Knox, RN, The Immune Queen

What, exactly, are you testing and why?

Vitamin B12 blood testing is very inaccurate, so why would you want to do it? What are you trying to find out? If you already take B12, why would you need to get tested for B12 deficiency? I'm a bit confused.

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