Short answer
Choose mushrooms from reputable food sellers, keep them refrigerated, and discard products with an off odor, slimy surface or extensive spoilage. Wild mushrooms need expert, in-person identification before any consideration of eating them.
What nutrition data can tell you
Nutrition labels and food databases are the best way to compare a particular mushroom and serving size. Preparation changes the final dish too: oil, salt, sauces and portions all affect what a meal provides.
For a searchable public reference, use USDA FoodData Central. It reports food composition data; it does not turn an individual food into a cure or replace personalised dietary guidance.
A practical way to use mushrooms
- Use familiar cultivated varieties in meals you already enjoy.
- Store them in a breathable container in the refrigerator and use them while they are fresh.
- Cook to the texture and recipe you prefer, following normal food-handling practices.
- Do not use online information to identify a wild mushroom for eating.
Supplements need separate caution
A mushroom supplement is not the same as a serving of food. Product quality, ingredients and interactions can vary. Speak with a qualified clinician before starting a supplement if you take medicines, are pregnant or breastfeeding, or manage a health condition. See the FDA dietary-supplement information for consumer guidance.
