3 Review(s)

Rich Source of Vitamin A:A large number of substances belong under the umbrella of vitamin A, but they're all categorized as retinoids or carotenoids, according to the Linus Pauling Institute. Retinoids are responsible for the health benefits associated with vitamin A, such as normal vision, healthy skin and immune support. Red leaf lettuce is a rich source of carotenoids, primarily beta-carotene. Your body converts beta-carotene into retinol, so it contributes to your daily vitamin A. You'll also get a smaller amount of the carotenoids lutein and zeaxanthin, which work as antioxidants in your eyes. One cup of red leaf lettuce contains 2,098 international units of vitamin A, or about 70 percent of the recommended dietary allowance of 3,000 international units.