Always apply retinol at night, after cleansing. Put Retinol Treatment Cream in a thin layer to your entire face (be careful not to get it in your mouth, nose and eyes).
Do a patch test prior to using the products. Retinol can cause mild irritation, redness, and dryness, during the first few weeks of use because it is a potent active. Do not use with AHA/BHA and Vitamin C products.