Aside from their different colors, green leaf lettuce and red leaf lettuce have differing levels of various nutrients. Green leaf lettuce usually delivers more vitamin C. Red leaf lettuce typically has more vitamin K and potent antioxidants such as anthocyanin and quercetin that can protect the body from free-radical damage. However, both green leaf lettuce and red leaf lettuce are high in vitamin A, beta carotene, lutein, and zeaxanthin.