Prostaglandins
These 'Chemical Messengers' are found in every cell of our body & control a myriad of functions including body temperature, inflammation, dilation/constriction of blood vessels & so are key to keeping a healthy balance for our skin. They are not stored but are manufactured from Fatty Acids like Gamma Linolenic Acid (GLA). A deficiency of Prostaglandins will result in dryness & loss of suppleness of the skin.