Purported Benefits, Side Effects & More


Purported Benefits, Side Effects & More

Common Names

  • Vitamin H
  • Vitamin B7
  • Coenzyme R
  • D-Biotin
  • W Factor

For Patients & Caregivers

Tell your healthcare providers about any dietary supplements you’re taking, such as herbs, vitamins, minerals, and natural or home remedies. This will help them manage your care and keep you safe.

What is it?

Biotin is a vitamin your body needs to process sugar and fats. It’s found in foods such as organ meats (like liver or kidney), eggs, almonds, soy beans, peanuts, wholegrain cereals, brewer’s yeast, and vegetables.

Biotin supplements are available as pills, soft gels or gummies. They are taken alone or combined with other vitamins for healthy skin, nails, and hair.

What are the potential uses and benefits?

Biotin is used to:

  • Make brittle nails stronger
  • Make hair healthy
  • Treat skin rash
  • Treat disability due to multiple sclerosis (a disease of the brain and spinal cord)
  • Treat nerve pain due to diabetes

While biotin has many uses, more research is needed to prove that it helps with these issues.

Biotin is generally safe. But dietary supplements can interact with some medications and affect how they work. For more information, read the “What else do I need to know?” section below.

What are the side effects?

No side effects have been reported.

What else do I need to know?

It’s important to talk to your healthcare provider before taking biotin supplements. They can cause incorrect results on some lab tests. This can affect your care by:

  • Making it harder for your doctor to diagnose a disorder or disease that you may have
  • Not showing how you’re responding to a treatment
  • Making you go through additional testing 

For Healthcare Professionals

Scientific Name
Cis-hexahydro-2-oxo-1H-thieno[3,4-d]-imidazole-4-valeric acid
Clinical Summary

Biotin is an essential B vitamin that acts as an important coenzyme in carbohydrate and lipid metabolism. It is often taken alone or in combination with other vitamins for skin, nail, and hair health. It is also thought to benefit patients with diabetes and neuromuscular disorders.

Biotin is abundant in foods including meat, vegetables, and eggs. True deficiency is rare but can be caused by a genetic disorder (13) or malabsorption syndrome. Long-term use of certain anticonvulsant drugs can also induce biotin deficiency (11). These can be treated with supplementation.

Low serum levels of biotin have been associated with hair loss in some women (16), but evidence on biotin for hair growth or strengthening brittle nails is limited (3) (23) (24).

Although preliminary data found benefit with high-dose biotin for multiple sclerosis (17), a larger well-designed trial did not, but did find the potential for adverse consequences stemming from inaccurate lab test results (37). A review also cited insufficient evidence to support this use (30).

Exploratory studies suggest biotin may benefit patients with severe diabetic peripheral neuropathy (4), and improve glycemic control when taken with chromium (5). Randomized trials are needed to validate these observations. Some case reports suggest biotin may help reduce chemotherapy-related skin rash (18), but overall evidence is lacking to support its use for dermatological disorders (31).

Cases of inaccurate diagnostic test results have been linked to biotin supplement consumption. The American Association of Clinical Chemistry has issued a guidance document to help identify and address biotin interference in lab testing (32), and newer-generation assays now prevent biotin interference for hsTnT and TSH testing (38).

Food Sources

Liver, kidney, eggs, almonds, sweet potato, soy beans, peanuts, wholegrain cereals, brewer’s yeast, dairy products

Purported Uses and Benefits
  • Brittle nails
  • Hair loss
  • Dermatitis
  • Multiple sclerosis
  • Diabetic neuropathy
Mechanism of Action

Biotin is an essential component in carbohydrate and lipid metabolism. It is converted to the free active form by the enzyme biotinidase (1).

Studies have shown that biotin induces microtubule formation in neurons (7), and deficiency slows myelination (8), which may result in neuropathy. Biotin may also reduce the activity of interleukins and interferons, decreasing the number of leukocytes (9).

Adverse Reactions

Although biotin is generally safe, supplementation has been reported to interfere with certain lab tests, which may mask disease states, overestimate response to therapies, or subject patients to additional unnecessary diagnostic procedures (29). Newer-generation assays now prevent biotin interference for hsTnT and TSH testing (38).

Case Reports

Missed diagnosis of heart disease due to high intake of biotin: A patient death was related to false low troponin test results that were due to high intake of biotin (22). Additional reports have shown the susceptibility of cardiac troponin assays to biotin interference at levels achievable with over-the-counter supplements (28).

Tardive reactivation of progressive multiple sclerosis: In a 41-year-old patient suffering from primary progressive MS following treatment with high doses of biotin. His expanding disability status worsened along with a symptomatic new lesion on brain MRI, suggesting tardive inflammatory reactivation likely due to biotin (33).

TSH aberrations in the setting of immunotherapy: In a 68-year-old woman with hypothyroidism after initiating checkpoint blockade therapy while on biotin supplements. The patient was initiated on levothyroxine with subsequent dose increases that led to symptom resolution (39).

Herb Lab Interactions

Immunoassay interference caused by high-dose biotin supplementation: Incorrect test results during routine follow-up of a 54-year-old female patient with progressive multiple sclerosis and Hashimoto’s thyroiditis (29).

Inaccurate troponin test results: Due to consumption of high dose biotin (22), although newer-generation assays now prevent biotin interference for hsTnT and TSH testing (38).

Free Thyroxine and Thyroid Stimulating Hormone (FT4/TSH) assay: False-high values were attributed to high serum biotin levels in a neonate (12). Newer-generation assays now prevent biotin interference for TSH testing (38).

Qualitative urine hCG tests: Biotin supplementation may cause an invalid test result with some pregnancy tests (25).

Immunoassay interference: Biotin taken in moderate to high doses can result in either false-high or -low values (19).

Clinically significant lab errors: In a 67-year-old female with a history of multiple endocrine issues following biotin supplementation. Blood tests showed low TSH, low PTH, and mildly elevated calcium levels, which normalized after discontinuing biotin (34). Newer-generation assays now prevent biotin interference for TSH testing (38).

Thyroid function tests consistent with hyperthyroidism and a positive radioactive iodine uptake (RAIU) scan: In a 34-year-old female with a history of anxiety and depression, while taking biotin supplements. Her labs normalized after stopping biotin (35).

Erroneous elevations of results in some commercial serum 25-hydroxyvitamin d (25OHD) assays: Due to biotin supplementation (36).

Elevated testosterone due to interference of laboratory immunoassay: In a 15-year-old girl with unusual presentation of Denys-Drash syndrome, with end stage renal failure, severe genital abnormalities, signs of hyperandrogenism, and suspected dysgenetic gonads. Her clinical history revealed that she consumed biotin (40).

Dosage (OneMSK Only)
  1. Mason P. Dietary Supplements. London: Pharmaceutical Press; 2001.
  2. Keipert JA. Oral use of biotin in seborrhoeic dermatitis of infancy: a controlled trial. Med J Aust. 1976;1:584-5.
  3. Hochman LG, Scher RK, Meyerson MS. Brittle nails: response to daily biotin supplementation. Cutis 1993;51:303-5.
  4. Koutsikos D, Agroyannis B, Tzanatos-Exarchou H. Biotin for diabetic peripheral neuropathy. Biomed Pharmacother. 1990;44:511-4.
  5. Albarracin CA, Fuqua BC, Evans JL, et al. Chromium picolinate and biotin combination improves glucose metabolism in treated, uncontrolled overweight to obese patients with type 2 diabetes. Diabetes Metab Res Rev. Jan-Feb 2008;24(1):41-51.
  6. Debourdeau PM, et al. Life-threatening eosinophilic pleuropericardial effusion related to vitamins B5 and H. Ann Pharmacother. 2001;35:424-6.
  7. Braguer D, Gallice P, Yatzidis H, et al. Restoration by biotin of the in vitro microtubule formation inhibited by uremic toxins. Nephron. 1991;57(2):192-196.
  8. Desai S, Ganesan K, Hegde A. Biotinidase deficiency: a reversible metabolic encephalopathy. Neuroimaging and MR spectroscopic findings in a series of four patients. Pediatr Radiol. Aug 2008;38(8):848-856.
  9. Zempleni J, Helm RM, Mock DM. In vivo biotin supplementation at a pharmacologic dose decreases proliferation rates of human peripheral blood mononuclear cells and cytokine release. J Nutr. 2001;131:1479-84.
  10. Said HM, Redha R, Nylander W. Biotin transport in the human intestine: inhibition by anticonvulsant drugs. Am J Clin Nutr. 1989;49:127-31.
  11. Mock DM, et al. Disturbances in biotin metabolism in children undergoing long-term anticonvulsant therapy. J Pediatr Gastroenterol Nutr. 1998;26:245-50.
  12. Henry JG, Sobki S, Arafat N. Interference by biotin therapy on measurement of TSH and FT4 by enzyme immunoassay on Boehringer Mannheim ES700 analyser. Ann Clin Biochem. 1996;33 (Pt 2):162-3.
  13. Raha S, Udani V. Biotinidase deficiency presenting as recurrent myelopathy in a 7-year-old boy and a review of the literature. Pediatr Neurol. 2011 Oct;45(4):261-4.
  14. Singhi P, Ray M. Ohtahara syndrome with biotinidase deficiency. J Child Neurol. 2011 Apr;26(4):507-9.
  15. Komur M, Okuyaz C, Ezgu F, Atici A. A girl with spastic tetraparesis associated with biotinidase deficiency. Eur J Paediatr Neurol. 2011;5(6):551-3.
  16. Trueb RM. Serum Biotin Levels in Women Complaining of Hair Loss. Int J Trichology. Apr-Jun 2016;8(2):73-77.
  17. Tourbah A, Lebrun-Frenay C, Edan G, et al. MD1003 (high-dose biotin) for the treatment of progressive multiple sclerosis: A randomised, double-blind, placebo-controlled study. Mult Scler. Nov 2016;22(13):1719-1731.
  18. Ogawa Y, Kiba T, Nakano K, et al. [Prospective study of biotin treatment in patients with erythema due to gefitinib or erlotinib]. Gan To Kagaku Ryoho. Apr 2014;41(4):517-522.
  19. Elston MS, Sehgal S, Du Toit S, et al. Factitious Graves’ Disease Due to Biotin Immunoassay Interference-A Case and Review of the Literature. J Clin Endocrinol Metab. Sep 2016;101(9):3251-3255.
  20. Siddiqui U, Egnor E, Sloane JA. Biotin supplementation in MS clinically valuable but can alter multiple blood test results. Mult Scler. Apr 2017;23(4):619-620.
  21. Institute of Medicine Standing Committee on the Scientific Evaluation of Dietary Reference I, its Panel on Folate OBV, Choline. The National Academies Collection: Reports funded by National Institutes of Health. Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline. Washington (DC): National Academies Press (US), National Academy of Sciences; 1998.
  22. U.S. Food and Drug Administration. The FDA Warns that Biotin May Interfere with Lab Tests: FDA Safety Communication. Statement issued November 28, 2017.
  23. Patel DP, Swink SM, Castelo-Soccio L. A Review of the Use of Biotin for Hair Loss. Skin Appendage Disord. Aug 2017;3(3):166-169.
  24. Soleymani T, Lo Sicco K, Shapiro J. The Infatuation With Biotin Supplementation: Is There Truth Behind Its Rising Popularity? A Comparative Analysis of Clinical Efficacy versus Social Popularity. J Drugs Dermatol. May 1 2017;16(5):496-500. 
  25. Williams GR, Cervinski MA, Nerenz RD. Assessment of biotin interference with qualitative point-of-care hCG test devices. Clin Biochem. Mar 2018;53:168-170.
  26. Katzman BM, Lueke AJ, Donato LJ, et al. Prevalence of biotin supplement usage in outpatients and plasma biotin concentrations in patients presenting to the emergency department. Clin Biochem. Sep 2018;60:11-16.
  27. John JJ, Cooley V, Lipner SR. Assessment of biotin supplementation among patients in an outpatient dermatology clinic. J Am Acad Dermatol. Aug 2019;81(2):620-621.
  28. Frame IJ, Joshi PH, Mwangi C, et al. Susceptibility of Cardiac Troponin Assays to Biotin Interference. Am J Clin Pathol. Apr 2 2019;151(5):486-493.
  29. Mrosewski I, Neumann I, Switkowski R. Interference of High Dose Biotin Supplementation with Thyroid Parameters in Immunoassays Utilizing the Interaction between Streptavidin and Biotin: a Case Report and Review of Current Literature. Clin Lab. Jan 1 2019;65(1).
  30. Parks NE, Jackson-Tarlton CS, Vacchi L, Merdad R, Johnston BC. Dietary interventions for multiple sclerosis-related outcomes. Cochrane Database Syst Rev. 2020 May 19;5:CD004192.
  31. Thompson KG, Kim N. Dietary supplements in dermatology: A review of the evidence for zinc, biotin, vitamin D, nicotinamide, and Polypodium. J Am Acad Dermatol. 2020 Apr 29:S0190-9622(20)30744-1.
  32. Li D, Ferguson A, Cervinski MA, Lynch KL, Kyle PB. AACC Guidance Document on Biotin Interference in Laboratory Tests. J Appl Lab Med. 2020 May 1;5(3):575-587.
  33. Demas A, Cochin JP, Hardy C, Vaschalde Y, Bourre B, Labauge P. Tardive Reactivation of Progressive Multiple Sclerosis During Treatment with Biotin. Neurol Ther. 2020 Jun;9(1):181-185.
  34. Rosner I, Rogers E, Maddrey A, Goldberg DM. Clinically Significant Lab Errors due to Vitamin B7 (Biotin) Supplementation: A Case Report Following a Recent FDA Warning. Cureus. 2019 Aug 23;11(8):e5470.
  35. Latif Z, Crupie MJ. Aberrant Thyroid Function Tests in a Patient Taking Biotin Supplements. Cureus. 2019 Aug 1;11(8):e5297.
  36. Carter GD, Berry J, Cavalier E, et al. Biotin supplementation causes erroneous elevations of results in some commercial serum 25-hydroxyvitamin d (25OHD) assays. J Steroid Biochem Mol Biol. 2020 Jun;200:105639.
  37. Cree BAC, Cutter G, Wolinsky JS, et al. Safety and efficacy of MD1003 (high-dose biotin) in patients with progressive multiple sclerosis (SPI2): a randomised, double-blind, placebo-controlled, phase 3 trial. Lancet Neurol. Dec 2020;19(12):988-997.
  38. Mzougui S, Favresse J, Soleimani R, et al. Biotin interference: evaluation of a new generation of electrochemiluminescent immunoassays for high-sensitive troponin T and thyroid-stimulating hormone testing. Clin Chem Lab Med. Nov 26 2020;58(12):2037-2045.
  39. N Ridgway F, A Gold K, C Barnachea L. Biotin-induced thyroid stimulating hormone aberrations in the setting of immunotherapy. J Oncol Pharm Pract. 2021 Dec;27(8):2057-2060.
  40. Bizzarri C, Antonella Giannone G, et al. Unusual Presentation of Denys-Drash Syndrome in a Girl with Undisclosed Consumption of Biotin. J Clin Res Pediatr Endocrinol. 2021 Aug 23;13(3):347-352.
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