Retinoids are one of the most well-documented wrinkle fighters around, reversing the signs of aging in study after study (after study). A class of chemicals derived from vitamin A, retinoids work in two ways: First, they help your skin slough off old cells and make new ones — a process our bodies are good at when young, but which slows down as we age. Second, they spur collagen production, improving elasticity and filling in lines — another natural process that tends to slow down with age.

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