Vitamin A (retinol, retinoic acid) is a nutrient important
to vision, growth, cell division, reproduction and immunity. Vitamin A also
helps the heart, lungs, kidneys, and other organs work properly. Vitamin A also
has antioxidant properties. Antioxidants are substances that might protect your
cells from free radicals. Free radicals might play a role in heart disease,
cancer and other diseases.
Vitamin A plays an important role in your vision. To see the
full spectrum of light, your eye needs to produce certain pigments for your
retina to work properly. Vitamin A deficiency stops the production of these
pigments. Your eye also needs vitamin A to nourish other parts of your eye
including the cornea. The cornea becomes dry, leading to clouding of the front of
the eye, corneal ulcers and vision loss.
Without enough vitamin A your eyes can not produce enough
moisture to keep them properly lubricated. Over-the-counter lubrication eye
drops contain vitamin A.
High intakes of some forms of vitamin A can be harmful. Getting
too much preformed vitamin A (usually from supplements or certain medicines)
can cause dizziness, nausea, headaches, coma, and even death. High intakes of
preformed vitamin A in pregnant women can also cause birth defects in their
babies. Women who might be pregnant should not take high doses of vitamin A
supplements.
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