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ChatGPT said: Retinol Serum is widely used to reduce wrinkles, fine lines, and dark spots while improving skin texture and clarity. Beginners are advised to start with 2–3 applications per week at night and gradually increase usage as their skin adapts. To apply, cleanse your face, use a pea-sized amount of retinol serum, and follow with a moisturizer. Since retinol makes the skin more sensitive to sunlight, always apply sunscreen during the day.