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Other Nutrients:To qualify as a good source of any nutrient, foods must provide at least 10 percent of the recommended dietary allowance for that nutrient in one serving of the food, according to the U.S. Food and Administration. While red leaf lettuce is not a good source of other nutrients, a 1-cup serving supplies a smal and vitamin B-6. The same portion also contains 0.34 milligrams of iron, or 2 percent of women's and 4 percent of men's recommended dietary allowance, according to the Institute of Medicine.