SK-II LXP Moist Softening Serum contains the company’s signature ingredient, Pitera, a yeast ferment rich in amino acids, vitamins and minerals that aids the skin’s natural rejuvenation process. Combined with ultra – moisturizing sodium hyaluronic acid, this silky serum, which should be applied both morning and night, works to improve skin texture and softness by locking in moisture for up to 12 hours. $250.00