Retinol
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.

LEVEL 2 – pH OPTIMUM RETINOL ACTIVATE - 2000 IUs
For mild to moderate wrinkles, uneven texture, and fine pores
$165

LEVEL 3 – pH OPTIMUM RETINOL REPAIRING - 5000 IUs
For moderate to advanced wrinkles, irregular texture, and noticeable pores
$185

LEVEL 4 – pH OPTIMUM RETINOL RESTORING - 8000 IUs
For deep wrinkles, rough texture, and significant pores
$215