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

| Nutrient | Amount per 100g |
| --- | --- |
| Ash | 0.656 g |
| Beta-glucan | 1.95 g |
| Beta-sitostanol | 0 mg |
| Beta-sitosterol | 0 mg |
| Biotin | 10.8 µg |
| Calcium, Ca | 0 mg |
| Campesterol | 0 mg |
| Carbohydrate, by difference | 8.5 g |
| Copper, Cu | 0.047 mg |
| Delta-5-avenasterol | 0 mg |
| Delta-7-Stigmastenol | 0 mg |
| Energy | 46.4 kcal |
| Energy (Atwater General Factors) | 46.4 kcal |
| Energy (Atwater Specific Factors) | 38.5 kcal |
| Ergosta-5,7-dienol | 4.64 mg |
| Ergosta-7-enol | 1.12 mg |
| Ergosta-7,22-dienol | 0.804 mg |
| Ergosterol | 49 mg |
| Ergothioneine | 23.6 mg |
| Fiber, total dietary | 3.01 g |
| Glutathione | 15.7 mg |
| Histidine | 0.415 g |
| Iron, Fe | 0.338 mg |
| Isoleucine | 0.758 g |
| Leucine | 1.2 g |
| Lysine | 1.18 g |
| Magnesium, Mg | 13.5 mg |
| Manganese, Mn | 0.091 mg |
| Methionine | 0.303 g |
| Niacin | 6.45 mg |
| Nitrogen | 0.385 g |
| Phenylalanine | 0.743 g |
| Phosphorus, P | 89.9 mg |
| Potassium, K | 294 mg |
| Protein | 2.41 g |
| Riboflavin | 0.244 mg |
| Selenium, Se | 1.2 µg |
| Sodium, Na | 0.771 mg |
| Stigmasterol | 0 mg |
| Thiamin | 0.006 mg |
| Threonine | 0.851 g |
| Total lipid (fat) | 0.308 g |
| Tryptophan | 0.319 g |
| Valine | 1.33 g |
| Vitamin B-6 | 0.119 mg |
| Vitamin D (D2 + D3) | 0.07 µg |
| Vitamin D (D2 + D3), International Units | 2.8 IU |
| Vitamin D2 (ergocalciferol) | 0.07 µg |
| Vitamin D4 | 0.025 µg |
| Water | 88.1 g |
| Zinc, Zn | 0.625 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 2003599, usda_ff (released 2026-04-30). https://bettermenu.live/tools/ingredient-search/us/foods/king-oyster-mushroom-2003599/