What is considered a high dose of biotin ?

I take multivitamins that contain 50mcg of biotin per tablet. Is that considered a high dose? I only ask because I had a thyroid blood test and the results came back high for my t4 and t3 but it says people who take high dose biotin may have high readings. Is the dose of biotin I have been taking likely to have made a difference to the results of my blood test? 

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