You may have seen ads that swear that taking biotin will give you the hair of a shampoo commercial model, a glowing complexion, or unbreakable nails. A form of vitamin B also known as vitamin B7, biotin has attracted a ton of hype — but when it comes to nutrition, it can be hard to know what's real and what's completely overblown.

"Although there isn't good scientific evidence that taking biotin supplementswill help thinning hair to grow or nails to get stronger, people who take biotin supplements will often see a benefit," registered dietitian nutritionist Sonya Angelone, a spokeswoman for the Academy of Nutrition and Dietetics, tells Allure.

 

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