Lots of info about this online below is copy and paste of some of the info I read. I really like to stay on top of my bloods so in the future I will stop this supplement a week before having labs, as a precautionary measure.


The problem is that many common blood tests employ a biotin-streptavidin reaction as part of the test procedure. While the amount of usual dietary biotin intake is not expected to be high enough to affect these tests, biotin supplementation at doses greater than 1 mg per day can cause either falsely low or falsely high test results, depending on the analyte and platform used for testing. Biotin interference is particularly dangerous for patients in emergency situations who do not know they are taking high doses of biotin or when the treating physician does not know the patient is taking high doses. A literature search revealed an increasing number of published cases, most describing the problem of biotin interference in thyroid function tests.2 High-dose biotin can produce a dangerous combination of positive and negative interference among the thyroid tests (free thyroxine, free triiodothyronine, thyroid-stimulating hormone, and thyroid-stimulating hormone receptor antibodies) and paint a picture of Graves disease in patients who have either no clinical symptoms or unrelated symptoms. Without good clinical observations, this could lead to unnecessary procedures and treatments. Interference of high-dose biotin with thyroid tests is particularly troubling for patients with multiple sclerosis, as large doses of this vitamin are emerging as a new treatment.3 Interference with parathyroid hormone, follicle-stimulating hormone, luteinizing hormone, sex-hormone binding globulin, estradiol, progesterone, testosterone, cortisol, folate, vitamin B12, and ferritin testing has also been reported.2