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4. Gluten-Free
Unlike foods, cosmetics labeled "gluten-free" aren't regulated by the FDA. But do you even need gluten-free beauty products? Maybe, if you're gluten-sensitive and it's a lipstick, gloss, or balm, which you could ingest in tiny amounts. Otherwise, don't bother. "I've seen no evidence that a cream or lotion containing gluten is harmful," says John Zone, MD, chairman of the department of dermatology at the University of Utah School of Medicine. If you are gluten-sensitive, make sure your ingredients labels don't list wheat, rye, or barley.

TRY: RMS Beauty Lip Shine, $25; RMSbeauty.com