Can biotin interfere with Synthroid? Biotin doesn’t interfere with your thyroid medication, but it does interfere with your thyroid blood test and can mess up your numbers. Stop taking biotin at least 2 days before having a TSH blood test done.
Does biotin conflict with thyroid medication? When having your thyroid levels tested, you should avoid biotin, as it can interfere with accurate measurement. Usually, it is recommended to stop biotin for 1-2 weeks prior to checking thyroid labs. Too much iodine can also cause levothyroxine interactions.
Does biotin interact with levothyroxine? No interactions were found between biotin and levothyroxine.