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If you're like us, your FWP is probably flooded by folks swearing by biotin supplements for hair growth, but do they work?

First, a bit of background: Biotin is a B vitamin known for promoting healthy hair and helping with brittle nails. It's essential for the process by which cells create proteins. "Since our hair and nails are made of keratin, a type of structural protein, a biotin deficiency will negatively impact hair and nail growth," says Kseniya Kobets, MD, director of cosmetics dermatology at Montefiore Einstein Advanced Care. One major symptom of biotin deficiency is alopecia (hair loss). But here's the kicker: If you aren't deficient in biotin (most people aren't, FYI), taking biotin pills probably won't do much for you. The data on taking biotin to help grow your hair, skin, and nails just isn't there. But anecdotally, many reviewers we spoke to say saw improvements in these areas after taking biotin -- even when they're not deficient.

So what's a gal looking to grow her strands to do? We spoke with dermatologists and dietitians for their recommendations on the best biotin supplements for hair growth. And a quick reminder that supplements are not FDA-regulated, so it's always best to do your own research and check in with a doctor before adding one to your diet, especially if you take any medications.