Pioneering heart doctor Michael DeBakey dead at 99 (AP)

AP - When Dr. Michael E. DeBakey pushed forward with his groundbreaking research and maverick approach to medicine a half century ago, heart surgery was a medical marvel.

Vitamin A is a fat soluble vitamin. Its is essential for healthy eyes and vision; growth, including bones; healthy immune system, reproductive system; cells growth.

You can get vitamin A from these natural sources from food: liver, butter, whole milk, egg yolks, orange, yellow and dark green vegetables and fruits.

Deficiency Symptoms buy l-arginine hydrochloride dosage Vitamin A

- night blindness
- xerophthalmia
- dry skin
- itchy skin
- retarded growth
- susceptible to infection

How Much Do I Need?

The recommended daily intake (RDI) for vitamin A ranges from 1500 - 2500 IU, depending on your gender and life stages.

Therapeutic of Vitamin A Supplements

- Treatment for eye problems

- Skin disorder such as psoriasis and acne

- Protect against infection

- Promote recovery of infection

- Protect against cancer

Cautions for Vitamin A Supplements

Vitamin A should not be taken together with Vitamin A derivative acne drugs or broad spectrum antibiotics.

Vitamin A Alternative

While excessive vitamin A might be harmful or toxic to your body, however its precursor, beta carotene is not.

Beta-carotene is readily to be converted into Vitamin A. It is found abundantly in many foods. Beta-carotene acts as an antioxidant and helps to protect against heart disease, cancer and eye damage.

Therapeutic of Beta Carotene Supplements

- prevent cancer

- prevent heart disease

- boost immune system

- improve mental function

Cautions for Beta Carotene Supplements

A large dosage of beta carotene increases the risk of cancer in those who drink alcohol and smoke heavily.

Symptoms of Excess Intake of Beta Carotene Supplements

It is safe to take vitamin A at high dosage. However when you get excess beta carotene into your body, some area of your skin become orange-yellow.

Women with long term excess intake of beta carotene may possibility have menstrual abnormalities.

Though there is no establishes Recommended Daily Intake (RDI) for Beta-carotene, some experts recommend 10-30 mg a day.

You may get complete guide on vitamin, supplements and nutritional guide from the author's website.

Kim Kia Tan is an nutrition scholar and author of http://www.Best-Vitamin-Supplements-Guide.com who provides tips and advice how to prevent certain disease or cure symptoms with vitamin supplements and where to buy vitamin supplements online. Get a FREE copy of Guide to Vitamin and Supplements at Best Vitamin Supplement Express http://www.best-vitamin-supplements-guide.com/freebook page.