LEVEL 1

Formulated for mildly dry skin that needs occasional hydration, especially if using Level 1 or 2 Retinol.
Typically, skin in the 20s-30s age range. 

LEVEL 2

Formulated for moderately dry skin that often needs moisture. Especially if using level 2 or 3 Retinol.
Typically, skin in the 40s age range. 

LEVEL 3

Formulated for significantly dry skin needing frequent moisture attention.
Typically, skin in the 50s range.
 

LEVEL 4

Formulated for skin that can’t get enough moisture attention, needing constant hydration.
Typically, skin in the 50s plus age range, in winter, high altitude, dry conditions, or when using pH-Optimal Retinol Levels 2-4.