Ceramide is one of the main components of the skin barrier. As we all know, the skin barrier is mainly the stratum corneum on the surface of the skin, the main structure of this layer of cells contains a natural sebaceous membrane, which is a mixture of sebum, sweat, and keratinocyte secretion from this sebaceous gland to form oil to protect the skin. Ceramide, said to account for 50% of the proportion, if the skin barrier is damaged, there will be a lack of tissue, or functional problems, products to repair the skin barrier contain ceramide, the skin is to repair this barrier, it will reduce the external substances on the skin of various stimuli, or the invasion of bacteria, or the easy loss of water many problems, so it is also a natural moisturizing factor. In the structure of skin barrier enhancement, ceramide is the largest proportion, in addition to ceramide, there are triglycerides, phospholipids, squalene, cholesterol, but the proportion of ceramide is the largest. Nowadays, many skin care products have this ingredient, and some foreign skin care products are called ceramide, which is the word in English, ceramide, which is very similar to this. Ceramide has a role in protecting the skin barrier, repairing the skin barrier, moisturizing and anti-aging, so ceramide is now a very important ingredient in skin care.