URMC / Encyclopedia / Content Search Encyclopedia Nutrition Facts Onions, raw, 1 small Protein (g) 0.64 Total lipid (fat) (g) 0.06 Carbohydrate, by difference (g) 7.08 Energy (kcal) 29.4 Sugars, total (g) 3 Fiber, total dietary (g) 0.98 Calcium, Ca (mg) 15.4 Iron, Fe (mg) 0.13 Magnesium, Mg (mg) 7 Phosphorus, P (mg) 18.9 Potassium, K (mg) 100.8 Sodium, Na (mg) 2.1 Zinc, Zn (mg) 0.11 Copper, Cu (mg) 0.03 Manganese, Mn (mg) 0.09 Selenium, Se (mcg) 0.35 Vitamin A, IU (IU) 1.4 Retinol (mcg) 0 Carotene, beta (mcg) 0.7 Carotene, alpha (mcg) 0 Vitamin E (alpha-tocopherol) (mg) 0.01 Cryptoxanthin, beta (mcg) 0 Lycopene (mcg) 0 Lutein + zeaxanthin (mcg) 3.5 Vitamin C, total ascorbic acid (mg) 4.48 Thiamin (mg) 0.03 Riboflavin (mg) 0.02 Niacin (mg) 0.06 Pantothenic acid (mg) 0.09 Vitamin B-6 (mg) 0.1 Folate, total (mcg) 13.3 Vitamin B-12 (mcg) 0 Vitamin K (phylloquinone) (mcg) 0.28 Folic acid (mcg) 0 Folate, DFE (mcg_DFE) 13.3 Cholesterol (mg) 0 Fatty acids, total saturated (g) 0.02 Fatty acids, total monounsaturated (g) 0.02 Fatty acids, total polyunsaturated (g) 0.04