LESSON 1 · Skin Science
Your Skin Type Changes
Most skincare brands do not tell you this: skin type can change with age, seasons, hormones, and environment. The oily skin you had as a teen often shifts toward combination in your thirties and drier later in life.

Re-do the bare-face test every year, or whenever your current routine stops working. Your products should evolve with your skin, not stay the same for decades. A willingness to reassess is the difference between a routine that keeps working and one that quietly turns against you.