A normal healthy skin has a nice epidermis with a smooth outer layer that acts as a good barrier to intrinsic and extrinsic aging factors. A smooth and firm skin is due to Collagen, which keeps the skin firm, elastin, which supplies skin elasticity and glycosaminoglycans or GAGs, which keep the skin hydrated are all abundant.

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The body produces collagen naturally, it is in abundance when we are young, but unfortunately production of collagen starts to decline at about age 25, and continues. It decreases even more in women after menopause. Ageing skin can also be caused by other factors, such as sun damage, dehydration, lifestyle factors, and even certain medications.