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Anti-ageing: What is a peptide?

You can't have missed the hype in the past couple of years about the use of peptides in anti-ageing creams, but what do they actually do? We asked dermatologist Dr Diane Berson and she told us they're small proteins that stimulate the production of collagen and thicken the skin, which is how they're thought to be helpful in minimising the appearance of fine lines and wrinkles.