Hydration refers to the amount of water present in the skin, which retains moisture thanks to both the water circulating throughout the body and the moisture in the air.
It’s important to differentiate between hydration and moisturisation — the latter refers to the moisture that the epidermis draws from the outside environment. Cementing lipids also play a fundamental role in hydration. These types of lipids prevent both the loss of water-soluble substances and decreases in the natural moisturising factor (NMF), which has hygroscopic qualities that allow it to absorb and retain water in the stratum corneum.
Taking care of the skin so that it’s in an optimal state of hydration not only provides aesthetic benefits — maintaining its elasticity and flexibility — but also strengthens the skin’s barrier function.