United States Department of Agriculture
Agricultural Research Service
USDA Branded Food Products Database
Try FoodData Central Basic Report:  11260, Mushrooms, white, raw a 
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heading Nutrient Unit
Value per 100 g
cup, pieces or slices 70 g
cup, whole 96 g
large 23 g
medium 18 g
slice 6 g
small 10 g
cup pieces 35 g
Proximates Water g 92.45 64.72 88.75 21.26 16.64 5.55 9.24 32.36
Proximates Energy kcal 22 15 21 5 4 1 2 8
Proximates Protein g 3.09 2.16 2.97 0.71 0.56 0.19 0.31 1.08
Proximates Total lipid (fat) g 0.34 0.24 0.33 0.08 0.06 0.02 0.03 0.12
Proximates Carbohydrate, by difference g 3.26 2.28 3.13 0.75 0.59 0.20 0.33 1.14
Proximates Fiber, total dietary g 1.0 0.7 1.0 0.2 0.2 0.1 0.1 0.3
Proximates Sugars, total g 1.98 1.39 1.90 0.46 0.36 0.12 0.20 0.69
Minerals Calcium, Ca mg 3 2 3 1 1 0 0 1
Minerals Iron, Fe mg 0.50 0.35 0.48 0.12 0.09 0.03 0.05 0.17
Minerals Magnesium, Mg mg 9 6 9 2 2 1 1 3
Minerals Phosphorus, P mg 86 60 83 20 15 5 9 30
Minerals Potassium, K mg 318 223 305 73 57 19 32 111
Minerals Sodium, Na mg 5 4 5 1 1 0 0 2
Minerals Zinc, Zn mg 0.52 0.36 0.50 0.12 0.09 0.03 0.05 0.18
Vitamins Vitamin C, total ascorbic acid mg 2.1 1.5 2.0 0.5 0.4 0.1 0.2 0.7
Vitamins Thiamin mg 0.081 0.057 0.078 0.019 0.015 0.005 0.008 0.028
Vitamins Riboflavin mg 0.402 0.281 0.386 0.092 0.072 0.024 0.040 0.141
Vitamins Niacin mg 3.607 2.525 3.463 0.830 0.649 0.216 0.361 1.262
Vitamins Vitamin B-6 mg 0.104 0.073 0.100 0.024 0.019 0.006 0.010 0.036
Vitamins Folate, DFE b µg 17 12 16 4 3 1 2 6
Vitamins Vitamin B-12 µg 0.04 0.03 0.04 0.01 0.01 0.00 0.00 0.01
Vitamins Vitamin A, RAE µg 0 0 0 0 0 0 0 0
Vitamins Vitamin A, IU IU 0 0 0 0 0 0 0 0
Vitamins Vitamin E (alpha-tocopherol) mg 0.01 0.01 0.01 0.00 0.00 0.00 0.00 0.00
Vitamins Vitamin D (D2 + D3) µg 0.2 0.1 0.2 0.0 0.0 0.0 0.0 0.1
Vitamins Vitamin D IU 7 5 7 2 1 0 1 2
Vitamins Vitamin K (phylloquinone) µg 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Lipids Fatty acids, total saturated g 0.050 0.035 0.048 0.012 0.009 0.003 0.005 0.018
Lipids Fatty acids, total monounsaturated g 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
Lipids Fatty acids, total polyunsaturated g 0.160 0.112 0.154 0.037 0.029 0.010 0.016 0.056
Lipids Fatty acids, total trans g 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
Lipids Cholesterol mg 0 0 0 0 0 0 0 0
Other Caffeine mg 0 0 0 0 0 0 0 0

Footnotes
a  Ergosterol = 56 mg/100 g.
b  Mean value contains data based on the analysis of 5-methyltetrahydrofolate, 10-formyl folic acid, and 5-formyltetrahydrofolic acid plus total folate determined microbiologically
b  Mean value contains data based on the analysis of 5-methyltetrahydrofolate, 10-formyl folic acid, and 5-formyltetrahydrofolic acid plus total folate determined microbiologically
b  Mean value contains data based on the analysis of 5-methyltetrahydrofolate, 10-formyl folic acid, and 5-formyltetrahydrofolic acid plus total folate determined microbiologically