How is sub-health of skin? How to avoid or improve?

Oily skin, dry skin, sensitive skin, acne, etc. They are all sub-healthy skin or in a state of dermatosis, which is caused by many factors such as air pollution, mental stress and improper choice of cosmetics. Sub-healthy skin is not particularly attractive at ordinary times, but the metabolism, microcirculation, moisture and electrolyte of cells are hindered, mainly from the outside. It is dull and yellow, dry and aging, with excessive oil secretion, bloodshot and increased sensitivity. If your skin is similar to the above, it means that your skin is in a sub-health state. Conditioning from the inside out is the first thing that people with sub-health skin need to pay attention to. Vitamins A, C, E and B6 have antioxidant effects, which can strengthen the muscle defense system from the inside, deal with pigment deposition, destroy free radical activity and promote blood circulation. Therefore, people with sub-healthy skin should eat more fresh fruits and vegetables. Because fresh fruit contains a lot of vitamins and trace elements, it can meet the needs of the human body, such as apples, pomegranates, oranges and so on. Then, skin care products are still useful for sub-healthy skin. In terms of skin care, in addition to adjusting work and rest habits, cleaning, moisturizing and sun protection, we should also choose skin care products with antioxidant effects. Sun exposure, air pollution and other factors that lead to sub-health of the skin make the skin produce a lot of free radicals, which are the killers of skin health. Fighting free radicals is anti-oxidation. When choosing antioxidant products, we should pay attention to antioxidant components, such as vitamins C and E, polyphenols, lycopene, etc., which are traditional antioxidant effective components to help skin get rid of sub-health state. Vitamin A and its derivatives (mono-alcohol-mono-aldehyde-mono-acid), which are antioxidant components, are old-fashioned anti-aging components, and have comprehensive functions such as improving photoaging, promoting the synthesis of collagen and elastic fibers, regulating the metabolism of keratinocytes, thickening dermis, antioxidation and whitening. So although it is "old", it is still adopted by anti-aging products of various brands. The second peptide consists of more than two amino acids. For example, five amino acids combined together are called pentapeptides and six are called hexapeptides. At present, nine kinds of peptides have appeared. The larger the quantity, the more difficult it is to synthesize and the more expensive it is. This is why anti-aging skin care products are more expensive, because the cost of anti-aging technology development is relatively high. Now the most commonly used peptides in skin care products are pentapeptide and hexapeptide. The third vitamin E itself is a good antioxidant, which can enter skin cells and have a chain reaction against free radicals. It is superior to SOD in theory and can be used to prevent skin keratinization. Vitamin E has a strong antioxidant effect, which can prevent the oxidation of fatty compounds, vitamin A, selenium (Se), two sulfur-containing amino acids and vitamin C.