URMC / Encyclopedia / Content Search Encyclopedia Nutrition Facts Lettuce, butterhead (includes boston and bibb types), raw, 1 head (5" dia) Protein (g) 2.2 Total lipid (fat) (g) 0.36 Carbohydrate, by difference (g) 3.63 Energy (kcal) 21.19 Sugars, total (g) 1.53 Fiber, total dietary (g) 1.79 Calcium, Ca (mg) 57.05 Iron, Fe (mg) 2.02 Magnesium, Mg (mg) 21.19 Phosphorus, P (mg) 53.79 Potassium, K (mg) 387.94 Sodium, Na (mg) 8.15 Zinc, Zn (mg) 0.33 Copper, Cu (mg) 0.03 Manganese, Mn (mg) 0.29 Selenium, Se (mcg) 0.98 Vitamin A, IU (IU) 5398.56 Retinol (mcg) 0 Carotene, beta (mcg) 3238.81 Carotene, alpha (mcg) 0 Vitamin E (alpha-tocopherol) (mg) 0.29 Cryptoxanthin, beta (mcg) 0 Lycopene (mcg) 0 Lutein + zeaxanthin (mcg) 1993.49 Vitamin C, total ascorbic acid (mg) 6.03 Thiamin (mg) 0.09 Riboflavin (mg) 0.1 Niacin (mg) 0.58 Pantothenic acid (mg) 0.24 Vitamin B-6 (mg) 0.13 Folate, total (mcg) 118.99 Vitamin B-12 (mcg) 0 Vitamin K (phylloquinone) (mcg) 166.75 Folic acid (mcg) 0 Folate, DFE (mcg_DFE) 118.99 Cholesterol (mg) 0 Fatty acids, total saturated (g) 0.05 Fatty acids, total monounsaturated (g) 0.01 Fatty acids, total polyunsaturated (g) 0.19