Each year an estimated two hundred fifty thousand to half a million children go blind from vitamin A deficiency.

VOA: special.2011.03.01

Several years later, researchers discovered the exact cause of pellagra: a lack of the B vitamin known as niacin.

VOA: special.2009.01.27

Sweet potatoes, carrots and other darkly colored fruits and vegetables contain substances that the body can change into vitamin A.

VOA: special.2009.04.21

Several studies have not been able to show that taking vitamin supplements in addition to a balanced diet helps to prevent disease.

VOA: special.2010.09.14

That is,it is better to eat vitamin-rich foods to prevent disease instead of eating them to cure a disease after it has developed.

VOA: special.2009.04.21

They taste good. And they contain a lot of carotene, which the body makes into vitamin A.

VOA: special.2009.02.24

They play indoors. Everything's indoors. And so we're actually starting to see low levels of vitamin D in areas where the sun is plentiful."

VOA: special.2011.01.05

They think these products, called vitamin supplements, will improve their health and protect against disease.

VOA: special.2009.04.21

In some countries, milk producers add vitamin D to milk so children will get enough.

VOA: special.2009.04.21

One study found that older Americans do not get enough Vitamin C and required minerals.

VOA: special.2009.04.21

Ultraviolet light from the sun changes a substance in the skin into vitamin D.

VOA: special.2009.04.21

And,they said vitamin D supplements and calcium can protect the bones of older women.

VOA: special.2009.04.21

Bones need calcium and vitamin D to grow and reach their full strength.

VOA: special.2009.02.04

People who do not get enough vitamin A cannot see well in darkness.

VOA: special.2009.04.21

The word "vitamin" dates back to Polish scientist Casimir Funk in nineteen-twelve.

VOA: special.2009.04.21

Vitamin D increases levels of the element calcium in the blood.

VOA: special.2009.04.21

Vitamin A helps prevent skin and other tissues from becoming dry.

VOA: special.2009.04.21

Cabbage is a good source of vitamin C and other nutrients.

VOA: special.2009.03.03

Vitamin B-twelve is needed so folic acid can do its work.

VOA: special.2009.04.21

They are high in Vitamin C, fiber and other nutrients.

VOA: special.2010.03.09

Some older adults,for example, may not have enough vitamin B-twelve.

VOA: special.2009.04.21

Vitamin D prevents the children's bone disease rickets.

VOA: special.2009.04.21

Bacteria in the intestines normally produce vitamin K.

VOA: special.2009.04.21

Many adults now take vitamin supplements every day.

VOA: special.2009.04.21

Vitamin A is found in fish liver oil.

VOA: special.2009.04.21

More than half of them took vitamin supplements.

VOA: special.2009.04.21

The body stores little vitamin C.

VOA: special.2009.04.21