A skin barrier is the basic feature of the stratum corneum. The stratum corneum is the outermost layer of the skin and it is only 0.02mm thick. It not only retains skin moisture, but also serves as a barrier to protect skin from external irritants.

Sensitive and dry skin are easily affected by external irritants. If the turnover cycle of the skin is too fast, this will affect the growth of corneocytes and NMF decreases as a result. This means that the skin is unable to hold moisture well. If so, the skin will lack moisture, resulting in rough skin that loses shine and glow.

Dryness in the skin results in roughness, more obvious pores and the skin looks more dull. Too much dryness may cause fine lines. If the skin barrier function works properly to maintain moisture, the skin texture gets improved, resulting in the skin to have a more translucent tone and softer touch. Providing moisture is essential to the skin that is affected by abnormal turnover, and to return the barrier function to its normal state.