I have a small amount left after trying just one drop. The Azulen PDRN Ampoule is said to calm acne in just three days. It's luxuriously formulated with beauty ingredients that intensively care for skin troubles, centering on "Azulene (3000ppm)", which is used as a high-end treatment in Korean esthetics, along with Cica, Panthenol, and Allantoin. Fragrance-free and non-comedogenic, so it can be used with confidence even on sensitive skin.