Could any of you please tell me if I have to stop taking b12 or any other supplement before the thyroid blood test?
B12 and thyroid test: Could any of you please... - Thyroid UK
B12 and thyroid test
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Diggergy
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You have to stop taking any supplement that contains biotin a week before testing. This is most often found as either a separate supplement or as part of a B Complex or a "hair and nails" supplement, but it would be worth checking anything you take just to be sure.
The reason why biotin is a problem is discussed in these links :
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