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Read Vitamin Supplements - Part 1 right here.
Vitamin A
Dietary deficiency of vitamin A is uncommon in healthy people, except in older age groups. A is needed to absorb calcium, effects intestinal flora, and synthesizes body proteins. Although vitamin A is important for the function of the immune system, concerns about birth defects and bone loss, people should not take over 10,000 IU of supplemental vitamin A in the form of retinol without consulting a doctor.
Beta-carotene
Beta-carotene is a precursor to vitamin A, and may have a separate role in human health. Controlled research has shown that beta-carotene supplements can increase the numbers of some white blood cells and enhance cancer-fighting immune functions in healthy people who take 25,000–100,000 IU per day.


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