Group · Vegetables
Button mushroom
The button mushroom, or cultivated mushroom, has been grown since the 17th century, first in the underground quarries of the Paris region and today mainly in Anjou and Poland. White or brown, it is the same mushroom at different stages.
In terms of nutrition facts, raw it provides just 21 kcal per 100 g, with 2.11 g of protein, 1.83 g of carbohydrate and 1 g of fibre. It provides 364 mg of potassium and 10.4 mg of magnesium per 100 g, and contains 93.9 g of water.
Macronutrient breakdown
Nutrition table per 100 g
| Calories | 21 kcal |
| Kilojoules | 88 kJ |
| Protein | 2,2 g |
| Carbohydrate | 1,9 g |
| Fat | 0,4 g |
| Fibre | 1 g |
Micronutrients per 100 g
All measured nutrients, ranked by share of the daily reference intake.
- Copper0,29 mg29 %
- Vitamin B34,49 mg28 %
- Vitamin B51,14 mg19 %
- Potassium364 mg18 %
- Phosphorus108 mg15 %
- Selenium7,11 µg13 %
- Vitamin B60,15 mg11 %
- Vitamin B20,13 mg9 %
- Vitamin B9dietary folate equivalents28 µg
See the other 12 nutrients
- Vitamin D0,3 µg6 %
- Vitamin B10,06 mg5 %
- Zinc0,53 mg5 %
- Vitamin C3,18 mg4 %
- Manganese0,07 mg3 %
- Iodine4,81 µg3 %
- Magnesium10,4 mg3 %
- Iron0,31 mg2 %
- Omega-6 LA0,12 g1 %
- Calcium3 mg0 %
- Vitamin E0,02 mg0 %
- Omega-3 ALA0 g0 %
Anses Ciqual 2025. Source: Anses, 2025, Ciqual food composition table
Tips
21 kcal: one of the least energy-dense foods in our database. With 2.11 g of protein, which is notable for something so light. Mushrooms have a place of their own, neither vegetable nor starchy food.
Do not soak them. They absorb water like a sponge and release it during cooking, so they boil instead of browning. A damp cloth or a quick rinse is enough.
Very hot pan, a few at a time. That is the rule: too many mushrooms at once lower the temperature and they release their water. In small batches, they brown and concentrate their flavour.
Exposed to sunlight, they produce vitamin D. This is a genuine feature of mushrooms: their ergosterol turns into vitamin D2 under UV. Some producers use this process and say so on the packaging.
Raw in a salad, they are excellent. Sliced very thinly with lemon, which stops them blackening, and a drizzle of olive oil.
