Reply to What woukd you consider low b12?

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[quote=Anonymous][quote=Anonymous][quote=Anonymous]Stupid question: does taking a supplement give a false acceptable level? That is, do I need to abstain from the supplement for X length of time prior to testing to ensure that I'm getting an accurate measurement of my level?[/quote]

Supplements could give false acceptable levels. From a website that sells home test kits in the UK (the NHS is notorious for refusing to test for B12 except in the most extreme circumstances):
"To accurately determine deficiency or low levels of vitamin B12 you must stop taking any vitamin B12 supplements a few weeks before your test. Ask your doctor about this if it is prescribed to you. You should also avoid taking biotin supplements for at least 2 days before you test – again, check with your doctor if it’s prescribed to you."

https://www.hollandandbarrett.com/the-health-hub/vitamins-and-supplements/vitamins/vitamin-b/how-to-test-b12-levels/

As for what is low, Japan and Europe have a cut off of 500 to 550, and our cardiologist has said good neurologist wants at least 500.

[/quote]

Interesting. My level is considered normal at 410. I am vegetarian and have started taking gummy supplements.[/quote]

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