One of the skin’s most important functions is water conservation, acting as a semi-permeable
barrier to the loss of water (“transepidermal water loss”). The skin’s epidermal
and dermal layers have different functions, but water conservation depends on both.
The stratum corneum functions as a semi-permeable barrier, allowing the body to
survive in a hostile environment. The dermis is the supporting layer, forming a
matrix that provides shape and form to the skin through its sponge-like aperture
of water, collagen, elastin, and other substances.
The dermis also contains blood vessels that provide the epidermis and dermis with
water and nutrients to regulate skin temperature, lymph for the removal of toxins,
nerves, and more.
Preserving a youthful appearance requires an ideal hydration balance deep within
the epidermis and dermis to prevent excessive transepidermal water loss. Maintaining
this level of moisture requires a well- structured epidermis that is fully capable
of its role as a protective barrier.