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Q1: How often should RE-Time Serum be used? A1: Once or twice daily on clean skin, before moisturizer. Q2: Which skin types can use it? A2: All skin types. It is particularly effective for mature, dry, dehydrated, or elasticity-poor skin. Q3: Where can it be applied? A3: Face, neck, and décolleté. Q4: Is 0.1% retinol strong? A4: It is a moderate, well-tolerated concentration suitable for daily cosmetic use, offering visible results without the intensity of prescription retinoids.