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Skin is mainly made up of water, lipids and proteins. Water is, of course, what keeps it supple and hydrated but there is more to skin than just that.
Yes, our skin also has proteins in form of amino acids, collagen, keratin and many other chemical groups. And, the skin also has lipids which are molecules which create a protective barrier over the skin and guard the skin pores against intrusions from pathogens (bacteria, virus, etc.). Another thing which our skin has as lubrication is 'sebum' produced by sebaceous glands on the surface of the skin.They are also one of the kinds of epidermal lipids.
So, we have various things on the skin which provide hydration to the skin - sebum and the other kinds of epidermal lipids (lipids present on the skin surface). Let me also make a point here that there are various kinds of lipids in our body used for numerous function in the tissues and blood. So,we are talking only about the skin lipids.
Now, these lipids have to be replenished continuously. And, as we age, the replenishment of the lipids doesn't happen as well as in the younger ages. These lipids are mainly made up of fats. That is why it is advised to eat lots of fatty acids for a beautiful supple skin. Vitamin E is one of the most important vitamins found in the lipids. And, Vitamin C which is responsible for collagen production of the skin also takes care of the lipids production on the skin.
So, next time you think about hydrating your skin, hydrate it from the inside as well. All group Vitamins are extremely important for a healthy skin.