With advancement in science, we have gained better understanding about the physiology of the skin. Ceramide is like the mortar in cement. You need sufficient quantity and the right ratio of materials (sand, water, cement) to make a good mortar. A good skin barrier repair cream must be ceramide dominant and studies have shown that the ratio of 3:1:1 between the different types of lipids is optimal for skin barrier repair.
With an optimal lipid ratio of 3:1:1, transepidermal water loss (TEWL), also known as water loss from the skin, is the lowest.
This means at 3:1:1 ratio of the lipids, the skin is kept hydrated as skin barrier is repaired optimally. Ceradan is a scientifically designed ceramide-dominant moisturizer with the lipid ratio of 3:1:1 that helps replenish the lacking ceramide in AD skin.