‘I’ve Been a Dermatologist for 40 Years, and This Is the Skin-Firming Serum I Use Every Day’

© Photo: Getty Images/Andreas Kuehn dermatologist-anti-aging-serum While adding topical collagen to your routine may seem like the obvious way to account for these changes, that isn't actually the case. "Topical collagen won't help, because it's a very large molecule that cannot penetrate into living layers of skin so this does not help...

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Andreas Kuehn Ciraldo