COSRX Serums & Ampoules

COSRX puts its percentage on the front, so choose by the number: Vitamin C 23 is the highest strength and the most likely to sting, the Propolis and Hydrium ampoules carry no acid at all, 5 PDRN Collagen is the hydration and bounce route, and the Blue Peptide Bakuchiol serum is the retinol alternative. Only one high strength active per routine.