A sizeable proportion of people use cosmetic products containing enough biotin to interfere with several laboratory measurements, including those of thyroid function, new research finds.
The clinical takeaway, two endocrinologists told Medscape Medical News during the American Association of Clinical Endocrinology (AACE) Annual Meeting 2022, is that if an asymptomatic patient's thyroid test comes back suggesting hyperthyroidism, ask if they've been using hair, skin, or nail products containing biotin.
