SK-II Facial Treatment Clear Lotion in Beauty: NA. Achieve crystal clear skin with SK-II Facial Treatment Clear Lotion, a highly effective toner that gently exfoliates dead skin cells and refines the complexion with a mixture of Alpha Hydroxy Acid and Pitera. This fluid formula penetrates the skin’s surface, purifying the skin and prepping it for your favorite products.. Pitera is rich in vitamins, amino acids, and minerals that improve the skin’s natural rejuvenation process. AHA effectively purifies and exfoliates the skin. Suitable for all skin types. 5.4 fl oz. Twice daily, soak a cotton pad and sweep across the face and neck. Follow with SK-II Facial Treatment Essence. SKTW-WU2. 381519077456 . In the 1970s, SK-II scientists began a fervent quest to uncover a skincare ingredient that would make beautiful skin a reality. Researching a myriad of possibilities ranging from Chinese herbs to hot spring water - the secret they were looking for eluded them for a long time. It was only by a chance encounter that the scientists observed the soft and youthful hands of aged sake brewers. The astounding sight of the wrinkled faces of aged sake brewers contrasting their soft youthful hands remained seared in the memories of the SK-II scientists. Back in the confines of the laboratory, they surmised that the secret must lie in the yeast that the brewers’ hands were in constant contact with during the sake fermentation process. And that is how an exhaustive research of over 350 yeast strains began. Poring over even the smallest singular detail, the scientists spent over five years isolating the single yeast strain that held the secret to crystal clear skin. It was the birth of a miracle, a beauty revolution that would soon come to be known as PITERA.