The skincare concept known as 早c晚a功效 refers to using Vitamin C in the morning (早c) and Vitamin A, usually retinol, at night (晚a). This routine has become popular in modern skincare because it focuses on protecting the skin during the day and repairing it at night. The idea is simple but powerful: daytime defense and nighttime renewal. Morning Vitamin C Benefits (早c) Vitam... https://www.derm-mart.com.hk/collections/pigment-and-sun-damaged