Want to know some secrets about Japanese skin care company SK-II and the mysterious "essence" in its acclaimed Facial Treatment Essence? Then gather 'round, you curious sleuths! First, SK stands for Secret Key. And that secret key is Pitera: a proprietary, powerhouse ingredient discovered by SK-II scientists. Pitera is a natural yeast extract that keeps skin clear, soft and radiant while preventing lines and wrinkles from forming. It's rich in vitamins, minerals, amino acids and organic acids. And best of all, Pitera is the potent agent responsible for the anti-aging properties of SK-II products. It's the reason why devotees around the world have adopted new skin care routines centered around the brand's cleansers, moisturizers, serums, masks and more. So, what's not a secret about SK-II? The rave reviews it receives from users who have experienced its powerful results first-hand, and the fact that Nordstrom proudly carries SK-II as part of our stellar lineup of skin care products, including the most effective eye creams on the market.