All cosmetics are made up of several systems, the most typical of which is the emulsion.

However, water and oil are naturally mutually exclusive. Without a means, they cannot be allowed to coexist peacefully. Therefore, it is necessary to introduce a third component: a component that helps the water phase and the oil phase to “hand in hand”. The so-called "emulsified" component, that is, a surfactant or an emulsifier.

The above four components constitute the skeleton and foundation of a cosmetic, which we call a matrix, or a carrier.

Finally, the product has a validity period of 2-3 years. It must be ensured that the product is not mildewed, does not rot, and does not deteriorate. At this time, another type of ingredient will be introduced: antiseptic and stable type, which includes both preservatives, such as parabens. Classes, etc., also include some antioxidants to avoid rancidity such as oils and fats.

Here you need to explain:

In theory, any ingredient applied to the skin will affect the skin and therefore belong to a functionally active ingredient – as Professor Kligman said, even water is the only way to affect the skin, which directly promotes the “”. In-depth study of cosmetics.