How does vitamin A work?

Vitamin A comes from two sources. Retinoids, such as retinol, are the vitamin A that come from animal sources, such as liver, eggs, and dairy products and are the most quickly usable types of the vitamin. Carotenoids, such as beta-carotene, are the vitamin A that is found in plants, such as carrots and dark green vegetables. The body utilizes carotenoids to create retinol. The liver stores vitamin A and helps keep correct vitamin levels in the blood.

Vitamin A helps with the transfer of light into nerve signals needed for vision. It is required for cell growth and the process of making stem cells into various kinds of cells, bone growth, and reproduction. It helps with maintenance of healthy urinary, respiratory, and intestinal tracts, as well as with controlling genes for structural proteins, such as those in the skin.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.