What is the role of antioxidants in skincare?

Antioxidants neutralize free radicals — unstable molecules generated by UV exposure, pollution, and metabolic processes — before they can damage skin cells, break down collagen, and accelerate aging. Common skincare antioxidants include vitamin C, vitamin E, ferulic acid, resveratrol, green tea extract, and niacinamide. Antioxidant serums are most effective in the morning, applied before SPF, to boost photoprotection throughout the day.