"RC LIQUID", not sticky like cream, was developed with adherence to fresh and rich skincare. Nobody thought it possible, but the new way of thinking, "let's create cosmetics with a moisturizing ingredient similar to the skin", resolved the issue. Moisturizing ingredient NMF (Natural Moisturizing Factor) consisted of 52% amino acids, so we tackled the challenge by dissolving oil with a composition close to the skin surface lipids in water using the amino acid emulsifier. This completely new type of skincare products was coined "beauty serum" , and introduced to the market.
The second beauty serum "ESPRIQUE MOISTURE ESSENCE" was developed 4 years later. It is a skincare product containing a large amount of amino acid, in thorough pursuit of skin moisture. However, usually the more amino acid, the stickier and the less comfortable to use. We adjusted the prescription over and over again until the stickiness was gone, and finally completed the development.
Pioneered by these two, beauty serum later became recognized as "thicker than lotion with moisturizing and emollient capabilities similar to cream and emulsion". In 1986 Fair Trade Council of Cosmetics approved it as a cosmetics type, and it became an important category of skincare products.