Biotin
A water-soluble B vitamin (B7) added in tiny amounts to fortify foods or sold in supplements; it helps enzymes that process fats, carbs, and amino acids.
Should I eat Biotin?
Biotin is an essential B vitamin, and the tiny amounts added to foods are safe and help meet daily needs. The main caution is with milligram-level supplements, which can distort certain lab tests without clear added benefit for most people.
Summary
Biotin helps your body turn food into energy and is required in very small amounts. In the U.S. the Daily Value is 30 micrograms, while Europe sets an adult Adequate Intake of 40 micrograms, and deficiency in the general population is rare. Safety reviews have not identified toxicity at usual or even high intakes, so no upper limit exists. The most important risk is interference with some blood tests when taking high-dose supplements, not from the tiny amounts in fortified foods. If you use high-dose biotin, tell your clinician before lab work so results are interpreted correctly.
Key Research Points
High-dose biotin can skew lab tests
Milligram-level supplements can cause falsely low or high results on some blood tests—especially troponin and certain thyroid assays—risking misdiagnosis; tell your clinician before any lab work.
No upper limit, but mega-doses rarely needed
Authorities have not set a tolerable upper intake level due to low toxicity, yet evidence that large doses improve hair, skin, or nails in healthy people is limited; most adults meet needs with diet or a standard multivitamin.
Fortified foods use tiny, safe amounts
Foods typically add micrograms to meet the U.S. Daily Value of 30 μg (EU AI 40 μg), far below the single- or multi-milligram supplement doses linked to test interference.
Overview
What is it?
Why is it used?
Origin
Biotin’s story traces back to early 1900s reports of “egg-white injury,” where raw egg whites (rich in avidin) bound biotin and caused deficiency symptoms in animals. In 1936, Fritz Kögl and Benno Tönnis isolated crystalline biotin from egg yolk; Hungarian scientist Paul György had called it ‘vitamin H’ for Haar und Haut (hair and skin). Modern biotin is produced at scale by multi-step chemical syntheses and, increasingly, engineered-microbe fermentation.
Process: Chemical synthesis or engineered-microbe fermentation, then crystallize
Steps
Chemicals
Research & Safety
Potential Concerns
The main concern is lab test interference from high-dose supplements, which can cause falsely low or high results on troponin and certain thyroid tests. No upper intake level has been set, but mega-doses show limited proven benefits for hair, skin, or nails in people without deficiency. The biotin used in foods is a highly purified vitamin made by synthesis or fermentation; the risk comes from unnecessary high dosing, not from the refining process. If you use high-dose biotin, tell your clinician before lab work.
Potential Benefits
Biotin supports normal energy metabolism by helping key enzymes use fats, carbohydrates, and amino acids. Fortified foods and multivitamins provide reliable microgram doses to meet the Daily Value. This can help people with low intake patterns or increased needs. Biotin is also used medically for rare genetic biotinidase deficiency identified on newborn screening.
Digestive Effects
At the tiny amounts used to fortify foods, biotin does not cause gastrointestinal side effects. Even at high supplemental intakes, reports of stomach issues are uncommon, and safety authorities have not identified a toxicity threshold. The practical concern with large doses is interference with certain lab tests rather than digestive intolerance. Most people tolerate typical multivitamin-level amounts well.
Limit Consumption
Certain medications, such as some anticonvulsants, can lower biotin levels; your clinician may monitor status if you take these. Consuming large amounts of raw egg whites can reduce biotin absorption due to avidin binding. Pregnancy and lactation have similar Adequate Intakes to other adults (with a small increase during lactation), and deficiency is uncommon. People taking high-dose biotin should inform clinicians before blood tests, because some assays are sensitive to biotin and may give false results. Newborns with biotinidase deficiency require medical management with biotin.
Fact Sheet
Regulatory Status
ESG & Sustainability
Allergens and Diet
Natural Alternatives
Egg yolk
Liver (beef or chicken)
Sunflower seeds
Citations
Biotin – Health Professional Fact Sheet
2022-01-10NIH Office of Dietary Supplements • NIH ODS
Biotin Interference with Troponin Lab Tests
2022-06-21U.S. Food and Drug Administration • U.S. FDA
FDA reminds… potential biotin interference
2019-11-05U.S. Food and Drug Administration • U.S. FDA
Scientific Opinion on Dietary Reference Values for biotin
2014-02-24EFSA NDA Panel • EFSA Journal
21 CFR Part 182 — Biotin (§182.8159)
2025-09-22U.S. eCFR • eCFR (HHS/FDA)
Advances and prospects in microbial production of biotin
2024-06-18D. Ma et al. • Microbial Cell Factories
The production of biotin by genetically modified microorganisms
2011-01-01S.W. Brown • University of Nottingham (PDF)
7 CFR §205.605 — Nonagricultural (nonorganic) substances allowed
2025-04-14USDA AMS (eCFR) • USDA eCFR