The role and function of vitamin A:

1, enhance vision

Vitamin A can enhance the human eye's ability to self-regulation and the ability to adapt to the light and dark two environments, effectively preventing dry eyes and night blindness and a variety of eye symptoms, it is also able to improve the health of the retina. I know that when people get old not only have presbyopia, but also cataracts, glaucoma, macular degeneration and other symptoms occur, vitamin A can also reduce the risk of such lesions.

2, enhance immunity

Vitamin A can promote mucous membrane wetting, to maintain better immunity, but also enhance the vitality of the white blood cells, on the one hand, to prevent the invasion of external bacterial viruses, on the other hand, can cause the disease antigen of the lymphocyte response, from the inside to the body's protection.

3, improve the skin

Body toxins and free radicals can harm the skin, vitamin A intake can largely reduce this part of the damage. Our skin stays moist for a long time and is able to maintain the property of softness, in addition to preventing skin problems such as keratosis pilaris and dermatophytosis. At the same time, vitamin A promotes the production of excess sebum, which reduces the chances of acne and enhances the overall look and health of the skin.

4, accelerate the repair

Vitamin A in the protection and repair of bones has a significant role, especially in dental health, more intake of vitamin A helps the formation of dentin. Not only that, but vitamin A is also able to repair damaged skin tissues and improve age spots as well as fine lines, which is also very beneficial for skin tissues.

5, muscle growth

For the development of adolescents, muscle growth will be rapid, this time you need to supplement a certain amount of vitamin A, which can help adolescents better development, many malnourished adolescents is because of the lack of vitamin A caused by the parents must pay attention to the child to supplement vitamin A Oh.

6, lower cholesterol

Vitamin A is a fat-soluble vitamin, has a certain fat-soluble effect, can to a certain extent reduce the body's cholesterol level, for the middle-aged and elderly people, it is an important nutrient to prevent heart disease.

Expanded information:

Vitamin A is involved in the synthesis of glycoproteins, which are important for the normal formation, development, and maintenance of epithelium. formation, development and maintenance is very important. When vitamin A is insufficient or deficient, it can lead to abnormalities in glycoprotein synthesis intermediates, accumulation of low molecular weight polysaccharide-lipids, causing thickening and proliferation of the basal layer of epithelium, accelerated cell division, increased synthesis of tensile proton fibers, and flattening of cells, irregularity, dryness and other changes in the surface layer.

Vitamin A promotes protein biosynthesis and osteoblast differentiation. When it is deficient, the balance between osteoblasts and osteoclasts is disrupted, or bone proliferates excessively due to increased osteogenic activity, or formed bone is not resorbed. If a pregnant woman is deficient in vitamin A, it can directly affect fetal development and even stillbirth.

Vitamin A helps cell proliferation and growth. Animals lack of vitamin A, obviously growth stagnation, may be related to the animal's appetite and protein utilization decreased. Vitamin A deficiency affects the spermatic epithelium of male animals to produce spermatogonia, and changes in the epithelial cycle of the vagina in females, as well as the placental epithelium, so that embryo formation is impeded.

Vitamin A deficiency also causes a decrease in the activity of enzymes such as those needed to catalyze the formation of luteinizing hormone precursors, which reduces the production of steroids in the adrenal glands, gonads, and placenta, and may be responsible for affecting reproductive function.

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