“Skin Cycling,” the four-night skincare routine coined by @drwhitneybowe, is a gentle way to combine chemical exfoliation and retinoids into your regimen. Dr. Ingleton explains what it is, and how you would skin cycle with our line. Day 1. Cleanse - SuperFruit Exfoliating Tonic - Signature Moisturizer Day 2. Cleanse - Retexturizing Retinol Booster - Signature Moisturizer Days 3 & 4. Cleanse - Calming Hydration Booster - Signature Moisturizer