what's vitamin A good for ?

Answer 1

Without it, you go blind. Blindness in children is very common in areas where there is a shortage of Vitamin A in the diet. It can cause night blindness in adults.

Vitamin A plays an important role in vision, bone growth, reproduction, cell division and differentiation. It maintains the surface linings of your eye and your respiratory, urinary, and intestinal tracts.

Answer 2

It really depends. What kind of vitamin do you take? If it's a multivitamin then maybe. If you need to take one main vitamin, then no. You need a higher dose of that one vitamin, so I'd just take the vitamin itself. Just remember there is a form of added sugar in vitamin water.

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Answer 3

Vitamin A, a fat-soluble vitamin, is involved in the formation and maintenance of healthy skin, hair, and mucous membranes. Vitamin A helps us to see in dim light and is necessary for proper bone growth, tooth development, and reproduction.

Answer 4

Vitamin A Facts
Vitamin A is a fat soluable vitamin, meaning that it needs fats and minerals for proper absorption. Retinol Vitamin A comes from animal food sources and is stored in the body, whereas Beta-carotene Vitamin A comes from both plant and animal sources, and is not stored in the body. Beta-carotene is often referred to as provitamin A. Beta-carotene is a powerful antioxidant and immune system booster, working directly at the cellular level to combat free radicals that damage cells and promote disease. Studies show that people who have diets rich in beta-carotene have less cancer and coronary heart disease. Retinol Vitamin A benefits your vision, tissues, skin, teeth, hair, nails and bones in many ways.

How it Works
Vitamin A in its beta-carotene form neutralizes free radicals through its antioxidant properties. Studies have shown that it can prevent LDL (bad cholesterol) from harming the heart and coronary blood vessels, and it may also protect against cancer of the lung, breast, bladder, prostate and digestive tract. It inhibits abnormal cell growth, strengthens the immune system, and aids and fortifies cellular functions. Vitamin A in its retinol form plays a major role in vision, the maintenance of epithelial tissue (the outermost layer of cells of the skin and eyes and the lining of the respiratory, reproductive and gastrointestinal tracts), and bone growth.

Possible Benefits


Better vision, night vision and helpful in some vision disorders.
Inhibits cancerous growth and may reverse precancerous conditions.
Antioxidant properties help prevent heart disease and reduce risk of heart attack and stroke.
Powerful immune protector.
Protects against formation of cataracts.
Antioxidant properties may be helpful for Alzheimers, chronic fatigue syndrome, male infertility and fribromyalgia.
Promotes wellness of bones, eyes, hair, mucous linings, membranes, nails, skin and teeth.

Usage Guidelines
RDA for Retinol is 5000 IU. Use of higher doses of retinol in the amounts of 20,000-25,000 for periods of 8-12 months can produce toxicity symptoms like blurred vision, pain in the bones and joints, headaches, dry skin, and a poor appetite. Beta-carotene suggested use is 10,000 - 25,000 IU but since the body does not store this form of Vitamin A, dosages up to 100,000 IU reveal no known toxicity, although dosages higher than this can cause the palms and soles to turn an orangish color which will disappear when the dose is lowered.

Some Natural Sources
Dark green leafy vegetables and yellow, orange or red fruits and vegetables: sweet potatos, carrots, cantaloupe, broccoli, spinach, lettuce, fish liver oils, liver, kale, turnip greens, squash, tomatos, pumpkin, peaches, mangos, apricots, milk and dairy products.

Note
This information is based on reputable resources and scientific research but there is no guarantee that what we know today, will change with time. Readers should not use this information for self-diagnosis or self-treatment, but should always consult a medical professional regarding any medical problems and before undertaking any major dietary changes. This information is not meant to be substituted for medical advice.

Answer 5

Convincing health fanatics that mega-dosages of it is good for them, and making a fortune as their skin turns yellow from a toxic build up of Vitamin A in their fat tissues.

Answer 6

vitamin a- retinol ~

Answer 7

Vitamin A - good sources of nutrients - pamphlet
Pamphlet by: U.S. Department of Agriculture, Jan, 1990


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This is one in a series of fact sheets containing information to help you select foods that provide adequate daily amounts of vitamins, minerals, and dietary fiber as you follow the Dietary Guidelines for Americans. The Guidelines are--

* Eat a variety of Foods

* Maintain Desirable Weight

* Avoid Too much Fat, Saturated Fat, and Cholesterol

* Eat Foods with Adequate Starch and Fiber

* Avoid Too Much Sugar

* Avoid Too Much Sodium

* If you Drink Alcoholic Beverages, Do So in Moderation

What Is Meant By Good Food Source?

A good food source of vitamin A contains a substantial amount of vitamin A and/or carotenes (converted to vitamin A in the body) in relation to its calorie content and contributes at least 10 percent of the U.S. Recommended Daily Allowance (U.S. RDA) for vitamin A in a selected serving size or a unit of measure considered easy for the consumer to use. The U.S. RDA for vitamin A is 1,000 retinol equivalents per day.

The U.S. RDA for vitamin A is the amount of the vitamin used as a standard in nutrition labeling of foods. This allowance is based on the 1968 Recommended Dietary Allowances (RDA) for 24 sex-age categories set by the Food and Nutrition Board of the National Academy of Sciences. The 1989 RDA has been set at 800 retinol equivalents per day for women 19 to 50 years of age and 1000 retinol equivalents for men 19 to 50 years of age.

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As you can see, in 1985 and 1986, 33 percent of the vitamin A (including carotenes) in the diets of women came from fruits and vegetables. Dark-green vegetables and deep-yellow fruits and vegetables provided about half of the vitamin A in the form of carotenes coming from this group. Grain products and milk and milk products each supplied about 20 percent of the vitamin A consumed. Foods that contain small amounts of vitamin A but are not considered good sources can contribute significant amounts of vitamin A to an individual's diet if these foods are eaten often or in large amounts.

Why do We Need Vitamin A?

Vitamin A, a fat-soluble vitamin, is involved in the formation and maintenance of healthy skin, hair, and mucous membranes. Vitamin A helps us to see in dim light and is necessary for proper bone growth, tooth development, and reproduction.

Do We Get Enough Vitamin A?

According to recent USDA surveys, the average intake of vitamin A (and carotenes) by women and men 19 to 50 years of age met the RDA for vitamin A.

How Can We Get Enough Vitamin A

Eating a variety of foods that contain vitamin A (and carotenes) is the best way to get an adequate amount. Healthy individuals who eat a balanced diet rarely need supplements. In fact, too much vitamin A can be toxic. The list of foods will help you select those that are good sources of vitamin A as you follow the Dietary Guidelines. The list of good sources was derived from the same nutritive value of foods tables used to analyze information for recent food consumption surveys of the U.S. Department of Agriculture, Human Nutrition Information Service.

How To Prepare Foods To Retain Vitamin A

Vitamin A can be lost from foods during preparation, cooking, or storage. To retain vitamin A:

* Serve fruits and vegetables raw whenever possible.

* Keep vegetables (except sweet potatoes and winter squash) and fruits covered and refrigerated during storage.

* Steam vegetables and braise, bake, or broil meats instead of frying. Some vitamin A is lost in the fat during frying.

What About Fortified Foods?

Lowfat and skim milks are often fortified with vitamin A because it was removed from milk with the fat. Margarine is fortified to make its vitamin A content the same as butter.

Most ready-to-eat and instant-prepared cereals are fortified with vitamin A. Fortified ready-to-eat cereals usually contain at least 25 percent of the U.S. RDA for vitamin A. Since cereals vary, check the label on the package for the percentage of the U.S. RDA for a specific cereal.

What Is a Serving?

The serving sizes used on the list of good sources are only estimates of the amounts of food you might eat. The amount of a nutrient in a serving depends on the weight of the serving. For example, 1/2 cup of a cooked vegetable contains more vitamin A than 1/2 cup of the same vegetable served raw, because a serving of the cooked vegetable weighs more. Therefore, the cooked vegetable may appear on the list while the raw form does not. The raw vegetable provides the nutrient - but just not enough in a 1/2-cup serving to be considered a good source.

Answer 8

Cones and Rods of your retinas ("tv screen" in the back of the eyes); enhances vision, esp. at night.

Answer 9

I think its good for the eyes.

Answer 10

it is good for your eyes .