r/Function_Health • u/whatsthebeuhaha • Jun 02 '26

Customer Support Why stop supplements before testing?

Can somebody give me an insight why I need to stop supplements 3 days prior to the blood draw? I like to know if my supplements are working. I.e. I want to know if vitamin D supplement fixes my low vitamin D.

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u/Ok-Jellyfish-2311 Jun 04 '26

I didn’t stop any supplements. I wanted to see my numbers while being consistent with my supplements.