The Vitamin C 23 Serum

What you are looking at is The Vitamin C 23 Serum by COSRX, a skincare product. Skincare works on a schedule of weeks rather than days — most formulas need consistent use before there is anything to see. Apply to clean skin and give each layer a moment to absorb before the next — a rushed routine mostly pills. Where one is discounted, compare the size and edition rather than the headline alone. Check the period-after-opening symbol on the pack; once opened, a formula is on a shorter clock than the printed expiry. The best deal and the cheapest sticker price are not always the same listing once delivery is counted.