Vitamin A

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WHO | Vitamin A supplementation during pregnancy

While there is some indication that low doses of vitamin A supplements given to pregnant women on a daily or weekly basis, starting in the second or third trimester, can reduce the severity of decline in maternal serum retinol levels during late pregnancy and the symptoms of night blindness, current evidence indicates that vitamin A supplementation during pregnancy does not reduce the risk of illness or death in mothers or their infants.

Pregnant women should be encouraged to receive adequate nutrition, which is best achieved through consumption of a healthy balanced diet. Determination of vitamin A deficiency as a public health problem involves estimating the prevalence of deficiency in a population by using specific biochemical and clinical indicators of vitamin A status. Additional information for this recommendation can be found in the guidance summary and in the guideline, under 'WHO documents' below.

This is one of several WHO recommendations on vitamin A supplementation.

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The full set of recommendations can be found in 'Full set of recommendations'. This intervention is an Essential Nutrition Action targeting the first days of life. Health Topics. World Health Statistics. These studies are controversial, however, and a large study of more than 22, male physicians found no adverse health effects when these doctors took beta-carotene supplements of 50 mg every other day. The Institute of Medicine has established the following upper intake levels for the animal-based, retinol form of vitamin A to reduce the risk of vitamin A toxicity:.

Possible toxicity reactions from long-term daily consumption of vitamin A above these levels include birth defects, liver abnormalities, reduced bone mineral density that can lead to osteoporosis, and central nervous system disorders. August — Sweet potatoes are a promising way to help vitamin A-deficient children in South Africa, according to a June report in the journal Crop Science.

6 Health Benefits of Vitamin A, Backed by Science

Vitamin A deficiency is the leading cause of preventable blindness in children around the world. Sweet potatoes have naturally high amounts of beta-carotene which our bodies convert to vitamin A and are already a well-accepted food in South Africa. Laurie and others tested 12 varieties of sweet potatoes in humid subtropical, drier subtropical and temperate climates.

Impilo and Purple Sunset are two varieties that have shown the best results. Another variety called Bophelo has more beta-carotene than Impilo and tastes better. Laurie's team is working on more varieties with an eye toward pest-resistance, and she is working toward the building of more agro-processing units that would make flour, bread, muffins and other foods from sweet potatoes.

follow Heiting has more than 30 years of experience as an eye care provider, health educator and consultant to the eyewear industry. Columbia researchers work on preventing blindness from age-related macular degeneration and Stargardt's disease.

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Columbia University Medical Center. Press release.

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May Clinical trial of lutein in patients with retinitis pigmentosa receiving vitamin A. Archives of Ophthalmology.

How to Use Vitamin A (Retinol, Retinoids & Retin-A) In Your Skincare Routine For Clear Skin

April Agricultural Research Service, U. Department of Agriculture.

December A comparison of vitamin A and cyclosporine A 0. American Journal of Ophthalmology.

Vitamin A deficiency

February A randomized, placebo-controlled, clinical trial of high-dose supplementation with vitamins C and E, beta-carotene, and zinc for age-related macular degeneration and vision loss: AREDS Report No. October Vitamin A eyedrops for superior limbic keratoconjunctivitis.

Home Eye Care Eye Nutrition. By Gary Heiting, OD. Find an eye doctor near you and schedule an exam. More Articles. Eye Nutrition.

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