This advanced Bio-Performance Skin Filler Serums Refill system features both Night and Day formulas specifically engineered to promote visibly plump and firm skin. Developed by Shiseido, this two-step regimen works synergistically to address visible signs of aging throughout a 24-hour cycle. The Day Formula provides support under environmental stress, while the Night Formula concentrates on overnight repair and regeneration, leading to smoother, more resilient skin texture over time.