Abstract
The basic role of skincare formula is moisturization of skin controlling with suitable feeling. Natural moisturizing factor, sebum, and ceramide are nessesary for keeping healthy skin. Skincare products have a role to supply them into stratum corneum. These days study of dermatology is advanced remarkably. Many preventive or treating materials for aging problem of skin; wrinkle, pigmentation etc. are found. Therefore, it becomes more important for skincare product to penetrate them into suitable position of the skin. Skin penetration enhancers are synthesized and mechanical penetration systems are made. But they are not suitable as a cosmetic, because it is not always safety and a simple and easy way. New skincare formula are developed and their characters are investigated. Microemulsion is prepared by physicochemical or mechanical methods. This is transparence and much stable. Additionally, enhance of penetration of materials are expected.