Portabella Mushroom — USDA FoodData Central nutrition facts (per 100g)

| Nutrient | Amount per 100g |
| --- | --- |
| Ash | 0.8 g |
| Beta-glucan | 1.15 g |
| Beta-sitostanol | 0 mg |
| Beta-sitosterol | 0 mg |
| Biotin | 11.1 µg |
| Calcium, Ca | 3.24 mg |
| Campesterol | 0 mg |
| Carbohydrate, by difference | 4.66 g |
| Copper, Cu | 0.203 mg |
| Delta-5-avenasterol | 0 mg |
| Delta-7-Stigmastenol | 0 mg |
| Energy | 32.4 kcal |
| Energy (Atwater General Factors) | 32.4 kcal |
| Energy (Atwater Specific Factors) | 26 kcal |
| Ergosta-5,7-dienol | 4.68 mg |
| Ergosta-7-enol | 1.76 mg |
| Ergosta-7,22-dienol | 1.82 mg |
| Ergosterol | 48.9 mg |
| Ergothioneine | 2.33 mg |
| Fiber, total dietary | 1.88 g |
| Glutathione | 5 mg |
| Histidine | 0.562 g |
| Iron, Fe | 0.139 mg |
| Isoleucine | 1.01 g |
| Leucine | 1.63 g |
| Lysine | 1.46 g |
| Magnesium, Mg | 9.04 mg |
| Manganese, Mn | 0.049 mg |
| Methionine | 0.347 g |
| Niacin | 3.9 mg |
| Nitrogen | 0.44 g |
| Phenylalanine | 1.02 g |
| Phosphorus, P | 87.5 mg |
| Potassium, K | 349 mg |
| Protein | 2.75 g |
| Riboflavin | 0.465 mg |
| Selenium, Se | 14.7 µg |
| Sodium, Na | 5.31 mg |
| Stigmasterol | 0 mg |
| Thiamin | 0.005 mg |
| Threonine | 1.21 g |
| Total lipid (fat) | 0.312 g |
| Tryptophan | 0.407 g |
| Valine | 2.16 g |
| Vitamin B-6 | 0.097 mg |
| Vitamin D (D2 + D3) | 0 µg |
| Vitamin D (D2 + D3), International Units | 0 IU |
| Vitamin D2 (ergocalciferol) | 0 µg |
| Vitamin D4 | 0 µg |
| Water | 91.5 g |
| Zinc, Zn | 0.389 mg |

Values are raw as published by USDA at the 100g basis — not rounded per 21 CFR 101.9(c) label-declaration rules, and 100g is USDA's publication basis, not a serving size any US nutrition label declares against.

Source: USDA FoodData Central, FDC ID 2003598, usda_ff (released 2026-04-30). https://bettermenu.live/tools/ingredient-search/us/foods/portabella-mushroom-2003598/