Retinol is the #1 skin-transforming ingredient of our time because it promotes the production of collagen and elastin — the building blocks for firm, plump, youthful-looking skin. Dr. Koo created 4 levels of retinol to be used at different ages and as your skin changes. Discover your level and experience the dramatic results.
For Retinol Novices or Sensitive Skin
For mild to moderate wrinkles, uneven texture, and fine pores