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Biotin deficiency is a relatively uncommon condition, and the vast majority of people can get enough biotin (also known as vitamin B7) just from eating a well-rounded, balanced diet, per Healthline.

In general, biotin can "improve the structural integrity of keratin in the hair shaft, which can reduce breakage," says Dr. Engelman. "Although it does not directly stimulate hair follicles, it ...

One important note: Excess biotin can also "cause incorrect results in certain laboratory tests that look at thyroid levels and blood markers that can help diagnose heart attacks," says Dr. Castillo.