In addition, stimulates the synthesis of cell proteins of the skin: collagen and elastin. Status of collagen and elastin in the skin over time in cross-linking of collagen molecules occur as a result of which collagen becomes hard, inelastic state. The enzyme collagenase, both domestic origin and added to the composition of cosmetic products, prevents the emergence of such links. Impact solar ultraviolet Interaction of reactive oxygen species (oxygen radicals) and molecules of fat, involve the formation of any internal cross-links in the major lipid molecules, or their conversion. Oxygen radicals arising from ultraviolet radiation, may be the cause of 'cross-links' in the molecules of elastin, collagen, hyaluronic acid, as well as reduce the rate of division of the basal epidermal cells. Counteract these processes capable of antioxidants.

Many scientists and beauticians advise after 40-50 years, regularly taking low doses of aspirin, which exhibits pronounced anti-oxidant properties, as well as vitamin C. But of course, better to use Natural sources of antioxidants – fruits, herbal extracts, herbal extracts and oils, which have a softer and more versatile effect. The status of hyaluronic acid Hyaluronic acid – a complex and very large molecule, which is located in the skin in the complex with water. The main function of hyaluronic acid – retention in the skin of moisture in the form of a gel. The gel transports toxins from the body and passes outside the bioactive substance. With aging, the action of peroxide compounds, the molecules of hyaluronic acid, there are intermolecular and intramolecular crosslinks that make this 'grid for water' is more rigid and less permeable. Therefore, in the older age significantly slower excretion from the body toxins and dermal oxygen, and bioactive substances from cosmetic products.

There is need for more active medical cosmetics. For example, the dissolution of cross-linked hyaluronic acid in the dermis carries the enzyme hyaluronidase. Therefore, the introduction of this enzyme in the composition of cosmetic products for rejuvenation is interesting innovation. At an early age, the skin is very elastic. But if weight loss occurs after 35-40 years, there is a 'residual strain' skin – the appearance of wrinkles or coarse wrinkles. The main reason is peroxidation lipid, which is why in collagen and elastin in the skin arise 'matching'. That is what leads to a decrease in skin elasticity. In addition, age-reduced ability of the epidermis to retain moisture, which also affects its elasticity. And yet – with facial and other short-term, but permanent changes in shape of skin having residual stresses, which eventually give rise to wrinkles. It is therefore impossible to establish health, cosmetics, suitable for all ages. On the contrary, cream composition for youth, may be useless for older people, and vice versa.