URMC / Encyclopedia / Content Search Encyclopedia Nutrition Facts Lettuce, red leaf, raw, 1 leaf outer Protein (g) 0.23 Total lipid (fat) (g) 0.04 Carbohydrate, by difference (g) 0.38 Energy (kcal) 2.72 Sugars, total (g) 0.08 Fiber, total dietary (g) 0.15 Calcium, Ca (mg) 5.61 Iron, Fe (mg) 0.2 Magnesium, Mg (mg) 2.04 Phosphorus, P (mg) 4.76 Potassium, K (mg) 31.79 Sodium, Na (mg) 4.25 Zinc, Zn (mg) 0.03 Copper, Cu (mg) 0 Manganese, Mn (mg) 0.03 Selenium, Se (mcg) 0.26 Vitamin A, IU (IU) 1273.64 Carotene, beta (mcg) 764.15 Carotene, alpha (mcg) 0 Vitamin E (alpha-tocopherol) (mg) 0.03 Cryptoxanthin, beta (mcg) 0 Lycopene (mcg) 0 Lutein + zeaxanthin (mcg) 293.08 Vitamin C, total ascorbic acid (mg) 0.63 Thiamin (mg) 0.01 Riboflavin (mg) 0.01 Niacin (mg) 0.05 Pantothenic acid (mg) 0.02 Vitamin B-6 (mg) 0.02 Folate, total (mcg) 6.12 Vitamin K (phylloquinone) (mcg) 23.85