B7 Safety & Side Effects
Our assessment
Based on FDA data, biotin has not been shown to cause any direct harm. The primary safety concern is not toxicity from the supplement itself, but the risk of inaccurate laboratory test results. Supplements containing biotin above recommended amounts may cause false results in some lab tests, including those that measure levels of certain hormones, like thyroid hormone FDA FAERS ↗.
Safety profile
Data not available for specific adverse event reports with report counts. The FDA has not identified a direct toxic effect from biotin. The critical risk is analytical interference: high levels of biotin in the blood can skew results for hormone tests, such as thyroid function tests, leading to misdiagnosis or inappropriate treatment FDA FAERS ↗.
How it works
Think of biotin as a coenzyme that helps your body process fats, carbohydrates, and proteins. It is essential for cellular energy production and supports the health of your hair, skin, and nails NIH ODS ↗.
Our recommendation
Be cautious if you take biotin supplements above the recommended daily amount, especially before lab work. Tell your doctor, pharmacist, and other healthcare providers about your biotin use. Patients taking antiseizure medications for at least 1 year should be aware that these drugs can significantly lower biotin levels FDA FAERS ↗. If you are having lab tests, ask your doctor if you should stop taking biotin for a few days beforehand to avoid false test results FDA FAERS ↗.
AI-assisted analysis. Data sourced from NIH ODS and FDA.
Safety Overview
Biotin has not been shown to cause any harm. However, supplements that contain biotin above recommended amounts may cause false results in some lab tests, including those that measure levels of certain hormones , like thyroid hormone.
Drug Interactions
Yes, some medications you take may affect your biotin levels, and biotin may interact with certain medications. For example, treatment for at least 1 year with antiseizure medications (used to treat epilepsy ) can significantly lower biotin levels. Tell your doctor, pharmacist , and other health care providers about any dietary supplements and prescription or over-the-counter medicines you take. They can tell you if the dietary supplements might interact with your medicines or laboratory tests , or if the medicines might interfere with how your body absorbs , uses, or breaks down nutrients such as biotin.