This coswell's sub brand, has gained its name from a combination of the words Bio, which means biologic, and Onsen. This meaningful title can simply reveal the content of this brand's products. All of the products contain natural minerals of the Japanese fountains, Onsen. Bionsen Spa Minerals were developed as the result of joint cosmetic and dermatological researches conducted by the University Clinic of Siena and the Center for Thermal Studies of Tokyo.