A two-layer serum is an item that is used by mixing a water layer and an oil layer before using it. Functional oil, such as vitamin C, is called multi-functional ingredient.
However, it has a weak point that it becomes unstable when dissolved in water and oxidizes when it touched with air.
For that reasons, we can understand two-layer serum is excellent construction.
It keeps stability, and by dissolving vitamin C in the oil layer to be able to prevent vitamin C from oxidation.
By mixing just before use, it can expect to keep the ingredients fresh and deliver more effective to the skin. We hope we can be your good partner to produce the products together.
If something we can cooperate with, please do not hesitate to contact us.