Skin Cycling is a skincare regimen designed by Dr. Bowe, a board-certified dermatologist. This routine practices a 4 day cycle. For each cycle, you alternate using active ingredient days and rest /recovery days. Active ingredients are the ingredients in your skincare products that are doing the actual “work.” Alternating between active and rest days helps reduce irritation and lets your skin recover from the active steps. Only use these steps at night! The Four Days Night One