Health Benefits and Common Uses of Biotin

woman brushing her hair
Alain Shroder/OKONY/Getty Images

Biotin is a B vitamin involved in the conversion of food into energy. Found naturally in a number of foods, biotin is essential for the formation of fatty acids and blood sugar (also called glucose). Sometimes referred to as "vitamin H," biotin aids in the metabolism of carbohydrates, fats, and proteins as well.


While most people get enough biotin from their diet, it is also made in the body by bacteria in the intestines. According to the National Institutes of Health, the daily adequate intake for adults 19 years of age and older is 30 mcg, which can usually be achieved through dietary consumption.

Although biotin deficiency is believed to be uncommon, it may occur in people who drink alcohol excessively or consume a great deal of raw egg white (which contains a protein that blocks the absorption of biotin). A genetic disorder of biotin deficiency, inflammatory bowel disease, and medications such as carbamazepine and other anticonvulsants, antibiotics, or isotretinoin may also increase your need for biotin.

Symptoms of biotin deficiency include thinning of the hair, a red scaly rash (especially around the eyes, nose, and mouth), depression, exhaustion, hallucinations, and tingling in the arms and legs.

Proponents claim that getting more biotin can help regulate your blood sugar, promote hair growth (including eyebrow, eyelash, and beard growth), and strengthen nails. Biotin is considered an important nutrient during pregnancy. Some supplement manufacturers also claim that biotin supplements can speed up metabolism and—in turn—promote weight loss.


There is very little scientific evidence to support the use of biotin supplements in people who do not have a biotin deficiency. Here's a look at some of the findings from the available human-based research.


Some research suggests that consuming biotin in combination with chromium picolinate may be of some benefit to people with diabetes. For instance, a 2008 study found that taking a chromium picolinate/biotin combination in addition to prescription anti-diabetic medication could improve blood sugar control in overweight or obese people with type 2 diabetes.

The study involved 447 diabetes patients, each of whom was assigned to receive either chromium picolinate with biotin or a placebo for 90 days (along with their diabetes medicine). By the study's end, those who took chromium picolinate and biotin showed a significantly greater improvement in blood sugar levels (compared to members of the placebo group).

Another study found that four weeks of taking chromium picolinate with biotin (in combination with diabetes medicine) helped improve blood sugar levels and reduce cholesterol levels in diabetes patients. This study involved only 43 people with poorly controlled diabetes.

Since both of these studies tested the use of biotin in combination with chromium picolinate, it's not known whether biotin alone might produce similar results.

Hair and Nail Health

Many biotin supplements are marketed as a way to improve hair and nail health. There is very little evidence to support the use of biotin for hair loss and brittle nails in people who do not have a biotin deficiency.

Side Effects and Safety

Biotin supplements can cause certain side effects, such as skin rashes, digestive upset, problems with insulin release, acne, and kidney problems. According to one report, biotin treatment was said to interfere with laboratory tests and mimic Graves' disease.

As with any supplement, the safety of long-term or high-dose use isn't understood. Biotin supplements haven't been tested for safety in pregnant women, nursing mothers, children, and those with medical conditions or who are taking medications. 

A Word From Verywell

To get your fill of biotin, include biotin-rich foods like liver, eggs, salmon, pork, beef, sunflower seeds, sweet potatoes, and almonds in your diet. If you have symptoms of a biotin deficiency or are considering taking biotin supplements, talk with your care provider before starting a supplement regimen.

Was this page helpful?
Article Sources
Verywell Fit uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
  1. National Institutes of Health Office of Dietary Supplements. Biotin: Fact sheet for consumers. Updated December 8, 2017.

  2. Trüeb RM. Serum biotin levels in women complaining of hair lossInt J Trichology. 2016;8(2):73‐77. doi:10.4103/0974-7753.188040

  3. National Institutes of Health Office of Dietary Supplements. Biotin: Fact sheet for health professionals. Updated June 3, 2020.

  4. Albarracin CA, Fuqua BC, Evans JL, Goldfine ID. Chromium picolinate and biotin combination improves glucose metabolism in treated, uncontrolled overweight to obese patients with type 2 diabetes. Diabetes Metab Res Rev. 2008;24(1):41-51. doi:10.1002/dmrr.755

  5. Singer GM, Geohas J. The effect of chromium picolinate and biotin supplementation on glycemic control in poorly controlled patients with type 2 diabetes mellitus: A placebo-controlled, double-blinded, randomized trial. Diabetes Technol Ther. 2006;8(6):636-643. doi:10.1089/dia.2006.8.636

  6. Al-Salameh A, Becquemont L, Brailly-Tabard S, Aubourg P, Chanson P. A somewhat bizarre case of Graves disease due to vitamin treatment. J Endocr Soc. 2017;1(5):431-435. doi:10.1210/js.2017-00054