Overall, biotin is a component of skin, hair, and nails, and supplementation of biotin is considered safe at the right servings. In 2017 and 2019, the FDA put out warnings that excessively high biotin consumption can cause false lab results, and it is now generally recommended that patients who have consumed 5,000-10,000 mcg of biotin wait a minimum of 8 hours before having blood collected for laboratory tests. Although lower levels of supplementation like Nutrafol Hair Growth Nutraceutical products (≤3,000 mcg) are generally considered a minimal risk of interference with lab tests, we would still advise waiting a minimum of 8 hours before having blood collected for laboratory tests. Please note that Nutrafol Women's Vegan and Nutrafol Men 50+ do not contain biotin.