This set includes a Retinol Night Cream Level 1 (0.15% Retinol) Starter Kit, and Retinol Night Cream Level 2 (0.3% Retinol) Refill, so you can Level-Up & Refill when your skin is ready. Retinol Night Cream No. 1 is a gentle beginner retinol that hydrates, kickstarts collagen renewal, and smooths early fine lines without irritation. Re