Быстрая перевозка груза более чем в 80 странах мира, включая Россия! ★Сегодняшние сделки  Обслуживание покупателей: +1-586-782-7852   |   Поддержка
ru
Россия
0
 Корзина
Товары в вашей корзине Количество Цена
подитог: 0 руб
0 руб

Learn all about Vitamin A

Also indexed as: A Vitamin, Retinol (Vitamin A)
Vitamin A: Main Image

How to take Vitamin A

For most people, up to 25,000 IU (7,500 mcg) of vitamin A per day is considered safe. However, people over age 65 and those with liver disease should probably not supplement with more than 15,000 IU per day, unless supervised by a doctor. In women who could become pregnant, the maximum safe intake is being re-evaluated. However, less than 10,000 IU (3,000 mcg) per day is generally accepted as safe. There is concern that larger intakes could cause birth defects. Whether the average person would benefit from vitamin A supplementation remains unclear.

Where to Find It

Liver, dairy products, and cod liver oil are good sources of vitamin A. Vitamin A is also available in supplement form.

Possible Deficiencies

People who limit their consumption of liver, dairy foods, and beta-carotene-containing vegetables can develop a vitamin A deficiency. Extremely low birth weight babies (2.2 pounds or less) are at high risk of being born with a deficiency, and vitamin A shots given to these infants have been reported in double-blind research to reduce the risk of lung disease. The earliest deficiency sign is poor night vision. Deficiency symptoms can also include dry skin, increased risk of infections, and metaplasia (a precancerous condition). Severe deficiencies causing blindness are extremely rare in Western societies.

Less severe deficiencies are more likely to occur with a variety of conditions causing malabsorption. A high incidence of vitamin A deficiency in people infected with HIV has also been reported. People with hypothyroidism have an impaired ability to convert beta-carotene to vitamin A. For this reason, some doctors suggest taking supplemental vitamin A (perhaps 5,000–10,000 IU per day) if they are not consuming adequate amounts in their diet.

Very old people with type 2 diabetes have shown a significant age-related decline in blood levels of vitamin A, irrespective of their dietary intake.



Vitamin A Benefits
Here is what people are saying about the benefits of Vitamin A.
Read Reviews >
Read Reviews >
Read Reviews >
Read Reviews >
Read more Vitamin A benefits >

Copyright © 2011 Aisle7.

Related Articles You May Like
Lip Balm Ingredients To Avoid
Lip Balm Ingredients To Avoid
Our Top 5 Products For Meditation
Our Top 5 Products For Meditation
Create Your Own Bug Spray and Repellent
Create Your Own Bug Spray and Repellent
Improve Posture To Eliminate Pain
Improve Posture To Eliminate Pain
Купоны и акции
Подписаться
eVitamins Россия, Copyright 1999-2018. Все права защищены.

Вся информация об определенных витаминах, добавках, процедурах или товарах, продаваемых на сайте или через сайт, не была проверена eVitamins или Администрацией США по продуктам и обороту лекарственных средств. Информация не предназначена для постановки диагноза, выбора препаратов, лечения и профилактики болезней. Информация на данном сайте представлена исключительно в информационных целях. Проконсультируйтесь с врачом перед началом диеты, упражнений или приемом любых добавок и витаминов, а также если предполагаете наличие каких-либо заболеваний.

Конфиденциальность | Условия