Skin Care Knowledge: Teach You to Know Vitamin A

Many people know that vitamins are indispensable to the health of the skin and human body, but they do not understand the Cosmetic ingredient list when purchasing and using cosmetics. Many merchants fool their friends through the asymmetry of information, and the people who do it are even more confused. . Some time ago, Huang Gong was always asking about nicotinamide. In fact, nicotinamide is also a Vitamin. It is what we call vitamin B3. Just taking this opportunity, Huang Gong added the types and effects of vitamins commonly used in cosmetics. And what is the name of the general cosmetics added to give you a little explanation, so that everyone is not confused. Vitamins are divided into A, B, C, D, etc. Let's start with vitamin A.

Vitamin A has a variety of physiological functions such as promoting growth and reproduction, maintaining normal secretion of bones, epithelial tissue, vision and mucosal epithelium. Vitamin A and its analogs have the effect of preventing precancerous lesions. Deficiency manifests as growth retardation, impaired dark adaptation and night blindness. Dry eye disease occurs due to dryness, desquamation, excessive keratinization, and decreased secretion of lacrimal glands in epidermal and mucosal epithelial cells. In severe cases, corneal softening and perforation can lead to blindness. Respiratory epithelial cells become keratinized and lose their cilia, making them less resistant to infection. The recommended intake of vitamin A (RNI) for adults in my country is 800ug retinol active equivalent per day for men and 700ug retinol active equivalent per day for women. Foods rich in vitamin A include livers, egg yolks, and milk powder of poultry and livestock. Carotene can be converted into vitamin A in the mucosa of the small intestine, red-yellow and dark green vegetables, and fruits contain a lot of carotene.

Vitamin A is also called retinol. Vitamin A is a skin normalizing regulator and an essential element for the normal regeneration of underlying cells. It can be absorbed through the skin, activate skin cells, promote cell metabolism to produce more collagen, form a thicker epidermis, and improve skin shielding Function.

Vitamin A also alters and regulates collagen synthesis: Vitamin A can help keep skin soft and plump, smooth and delicate and prevent skin cancer.

Vitamin A can also enhance the immune function of the skin and mucous membranes: Vitamin A is involved in the synthesis of glycoproteins, has the effect of enhancing the skin and mucous membranes, helps to promote the growth of the body, keeps the skin soft, and protects the skin from bacterial infection. Helps to heal burns, dandruff, dry skin. At the same time, vitamin A can improve the stability of cell walls and reduce the damage of air pollutants to the skin.

Auxiliary eye adaptation, lack of vitamin A may cause corneal softening or ulcers, dry eyes, prone to vision loss and night blindness.

Vitamin A is added to cosmetics and skin care products, and retinol propionate and retinol acetate are generally used as additives. Vitamin A is also widely used in Moisturizing, conditioning and Anti-Aging skin care products. Also great for treating acne and wrinkles.

When the human body lacks vitamin A, due to the reduction of glycoprotein synthesis intermediates, the classification of skin cells is accelerated, and the cells reach the skin surface without differentiation and maturity, resulting in abnormal stratum corneum metabolism. The death and shedding of skin tissue cells will clog the pores, and the oil cannot reach the skin surface, resulting in rough skin, dry scaling, and no smoothness, especially the skin of the arms, knees, and buttocks. In the long run, the pores are blocked by the dead cells and enlarged, and the oil Excessive secretion, the formation of black or white comedones acne. Due to less skin oil secretion, dry stratum corneum metabolism is abnormal, barrier function is reduced, and it is prone to allergies and infections. There may also be some ocular symptoms, such as dry conjunctiva, thickened keratinization, and corneal opacity.

The above is the lack of vitamin A in human skin and the addition and application of vitamin A in cosmetics.