Anti-aging skin creams claim to boost collagen production or oxygen circulation, or stimulate stem cells or enzymes that digest scar tissue and transform wrinkled skin. The creams moisturize, which does make dry skin look better, but most other claims have not been proven in published scientific studies. Though the FDA is investigating some products for crossing the line in making drug claims, dermatologists say the products are not likely to be harmful. "Go ahead, but it won't do much more than a moisturizer that is a lot less expensive," Dr. Simon Yoo, assistant professor of dermatology at Northwestern University's Feinberg School of Medicine, said.

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