Why you should reconsider daily biotin supplements.
Biotin, also called vitamin B7, is commonly taken to promote healthy hair, skin and nails. For most people, the body produces enough biotin from food, so routine supplementation is usually unnecessary.
- Lab test interference: Excessive biotin can skew results on numerous assays—such as troponin, thyroid hormones, parathyroid hormone, and electrolyte panels—leading to inaccurate diagnoses or improper therapy.
- Medication interactions: Certain antiepileptic drugs—carbamazepine, primidone, phenytoin, phenobarbital—can lower biotin levels. Talk to a clinician if you use these medicines before starting or continuing biotin.
- Minor side effects: While rare, some people experience mild gastrointestinal upset (nausea, cramping, diarrhea) or, less commonly, an allergic reaction with hives, wheezing or facial swelling. Immediate medical attention is required if such symptoms arise.
Because biotin is water‑soluble, the body eliminates excess amounts in urine, so toxicity is unlikely. Nevertheless, high daily intakes can still produce lab interference, so be sure to inform your health provider of any biotin use before tests.
Sources of biotin in a typical diet include organ meats, eggs, fish, meat, seeds, nuts and some vegetables. The U.S. has not set a specific Recommended Dietary Allowance; instead an adequate intake of 30 µg per day is suggested for healthy adults.
Only take biotin supplements if advised by a healthcare professional. They are found alone or in multivitamins. Because the U.S. Food & Drug Administration does not regulate supplement safety or purity, purchase from reputable manufacturers.
In summary, biotin is generally safe but unnecessary for most. Before daily use, consider the potential lab interference, medication interactions, and rare adverse reactions.