Retinol, fat-soluble vitamins that play an important role in vision, bone growth, reproduction, cell division, and cell differentiation, helps regulate the immune system in preventing or fighting off infections. Vitamin A that is found in colorful fruits and vegetables is called provitamin A carotenoid. They can be made into retinol in the body. Deficiency of vitamin A results in night blindness and keratomalacia.
A substance used in cancer prevention; it belongs to the family of drugs called retinoids.
Fat-soluble vitamin, unsaponifiable, heat and oxygen labile liquid. Occurs in body as a fatty acid ester. Found in yellow pigments of most vegetables and fruits. Essential for integrity of epithelial cells, a stimulus for new cell growth, aids in maintaining resistance to infections, increases longevity and delays senility.
A vitamin essential for (a) preventing night blindness, (b) promoting growth in children, (c) maintaining normal mucous secretions of the mucous membranes, (d) healthy skin, and (e) adequate tear secretions of the eyes. Rich food sources are leafy green vegetables and yellow vegetables, dairy products, eggs, and meats. Excessive amounts of result in serious health problems called hypervitaminosis is a fat-soluble vitamin.
A vitamin which is soluble in fat and can be formed in the body from precursors but is mainly found in food such as liver, vegetables, eggs and cod liver oil.
A fat-soluble vitamin, chemically termed retinol, which is especially. essential in the visual process. The vitamin can also reach the body as its precursor B-carotene. It is present in green leafy vegetables, papaya, milk, carrots, etc.
A vitamin needed for good vision, growth, reproduction and immune function. Vitamin A is found in liver, kidney and whole milk.
Vitamin A is not a single compound. It exists in several forms and is found in a variety of foods such as liver and highly colored vegetables. The International Union of Pure and Applied Chemistry- International Union of Biochemistry (lUPAC-IUB) Commission on Biochemical Nomenclature has proposed the following rules for naming the compounds having vitamin A activity: The parent substance, all-trans vitamin A alcohol, is designated “all-trans retinol.” Derivatives of this compound are named accordingly.
Vitamin A is a fat-soluble vitamin that is best known as a requirement for normal vision. It is also needed for other functions including cell differentiation and function, immune responses, and reproduction. Carotenoids, dark orange pigments, can be used to produce the vitamin, but are also potent antioxidants. A separate entry is provided for beta-carotene, which is a major carotenoid in the diet that produces vitamin A more efficiently than other carotenoids. Vitamin A is found in many animal products and is especially rich in eggs and fortified dairy foods. Carotenoids tend to be found at high levels in dark orange and dark green fruits and vegetables. Deficiency of vitamin A can produce night-blindness and many other clinical symptoms. Although a deficient state is likely to impair performance, supplementation does not appear to enhance endurance.386 The anti-oxidant properties of beta-carotene have been an area of interest for preventing oxidative stress in exercisers. The entry for antioxidants provides a description of potential roles of beta-carotene supplementation for athletes.
A vitamin important for new cell growth, healthy tissue, and normal vision (especially at night). Signs of deficiency include night-blindness, diarrhea, dry skin, xerophthalmia (abnormally dry eyes), tendency to intestinal infections, and impaired growth. Because vitamin A is a fat-soluble vitamin, stored in body fat, overconsumption can have serious consequences, progressing from nausea and blurred vision to headache, loss of hair, dry skin, and irregular menstruation to impaired growth, enlargement of liver and spleen, bone pain, increased skull pressure mimicking presence of a brain tumor and, in pregnant women, birth defects.
Retinol, a fat-soluble vitamin important for healthy eyes, skin, hair, and mucous membranes. Vitamin A is also essential for proper growth and reproduction, as well as normal bone development. Carotenes, which are building blocks of vitamin A, are antioxidants that prevent free-radical- induced changes that damage cells. Beta-carotene, a carotene found in plants, is converted into vitamin A by the liver.
A fat-soluble vitamin that occurs preformed in foods of animal origin (especially milk products, egg yolk, and liver) and is formed in the body from the pigment β-carotene, present in some vegetable foods (for example cabbage, lettuce, and carrots). Retinol is essential for growth, vision in dim light, and the maintenance of soft mucous tissue. A deficiency causes stunted growth, night blindness, xerophthalmia, keratomalacia, and eventual blindness. The recommended daily intake is 7S0 μg retinol equivalents for adult ( 1μg retinol equivalent = 1 μg retinol or 6 μg β-carotene).
A fat-soluble vitamin formed within the body from alpha, beta, and gamma carotene, the yellow pigments of plants. It is essential for normal growth and development, normal function and integrity of epithelial tissues, formation of visual pigment, and normal tooth and bone development. It is stored in the liver. The recommended daily requirement for adults is 1000 mg. Retinol is the form of vitamin A found in mammals. One retinol equivalent is equal to 6 mg of beta-carotene. Excessive intake of vitamin A may cause acute or chronic effects and may increase risk of developing cancer in smokers.
Supports the overall health of the skin; aids in the health, function, and repair of skin cells; has been shown to improve the skin’s elasticity and thickness.
A fat-soluble vitamin essential for growth, the development of bones and teeth, cellular structure, night vision, and the protection of the respiratory, digestive, and urinary tract linings from infection.
Vitamin A is absorbed in the body as retinol, which can be found in sources like liver, fish liver oils, egg yolks, and dairy products. It’s also added to items like margarine. Additionally, the body can convert carotene, found in various fruits and vegetables, into retinol.
A lack of Vitamin A is uncommon in developed nations and is usually caused by issues with nutrient absorption. The deficiency can also be a side effect of long-term use of specific cholesterol-lowering medications. However, in some developing countries, Vitamin A deficiency is more prevalent due to inadequate diets.
The initial sign of a Vitamin A deficiency is difficulty seeing in the dark, commonly known as night blindness. This is followed by symptoms like eye dryness and inflammation, damage to the cornea known as keratomalacia, and ultimately, loss of vision. The deficiency can also lead to a weakened immune system, dry skin, and stunted growth in children.
Extended overconsumption of Vitamin A can lead to symptoms such as headaches, nausea, diminished appetite, peeling skin, hair loss, and irregular menstrual cycles. In extreme cases, it may result in an enlarged liver and spleen. High levels of Vitamin A, particularly in the retinol form, have been associated with a heightened risk of bone fractures. Overdosing during pregnancy can lead to birth anomalies, and in infants, it may result in deformities of the skull, which can be reversed with dietary adjustments.
Vitamin A is essential for preserving healthy skin and good vision. A lack of this vitamin can result in the deterioration of skin cells, a heightened vulnerability to infections, and potentially cause night blindness. Sources of vitamin A include fish liver oil, dairy fat, and a variety of colorful vegetables. It is also likely to play a role in normal growth and development.
Vitamin A is essential for maintaining healthy skin and good eyesight. A lack of vitamin A can result in skin cell deterioration, heightened vulnerability to infections, and potentially cause night blindness. This vitamin is present in fish liver oil, milk fat, and various colorful vegetables. It likely also plays a role in supporting normal growth and development.