Well, the answer isn’t so clear-cut. “Biotin is essential for hair and nail growth; biotin deficiency, in fact, can lead to hair loss and brittle nails,” says Carmen Castilla, MD, a board-certified ...

We may earn an affiliate commission from links. Well, the answer isn’t so clear-cut. “Biotin is essential for hair and nail growth; biotin deficiency, in fact, can lead to hair loss and ...

Dana Schulz is an experienced editor, writer, and content strategist who is just as likely to be crunching the ...