Achieve smoother, brighter, younger-looking skin with SK-II. The secret traces back to when SK-II scientists visited a sake brewery and discovered that the elderly workers possessed remarkably youthful hands. After years of research, they discovered the source of this phenomena, a nutrient-rich liquid called Pitera. Each formula features Pitera, a unique yeast strain full of vitamins, amino acids, minerals and organic acids that work together to encourage the skin's natural renewal process. It closely mimics the skin's own natural moisture factors, which leads to improved radiance, firmness and a more even skin texture.