Women who might become pregnant should be especially cautious with vitamin A supplements or avoid them entirely .

Functions of Vitamin A. In the eyes, retinal is combined with a protein called opsin to give rhodopsin, an essential light absorbing molecule needed for color vision and seeing in dim light.

Interest in vitamin A is booming as Americans seek alternative treatments for measles. While the essential nutrient has a host of health benefits, too much can actually harm the body.

Chemical Cousin Of Vitamin A Restores Gene Function In Former Smokers. ScienceDaily. Retrieved June 3, 2025 from www.sciencedaily.com / releases / 2003 / 02 / 030206080315.htm.