Vitamin C serum works only at a pH below 3.5 and 8–20% concentration. Forms, oxidation signs, morning placement, and skin type guide inside.
Skincare Routines & Ingredients
Science-backed skincare routines covering cleansers, serums, retinol, niacinamide, and layering methods for every skin type and concern.
Wrong product order reduces active absorption by 40%. Skincare layering sequence for oily, dry, combination, and sensitive skin, step by step.
Retinoids share a conversion ladder: retinol (2 steps), retinal (1 step), tretinoin (0). Each suits a different concern and skin type.
Niacinamide at 2% repairs the barrier; at 5% brightens skin; at 10% controls acne. Compatible with retinol, vitamin C, AHAs, and BHAs.
Retinol for beginners starts at 0.025-0.1% for sensitive skin. Follow the 1-2-3 weekly schedule, apply to dry skin, and wear SPF 30+ daily.