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    Ingredient guide · Ingredient reference

    Mushroom protein: fresh and dried weights are different comparisons

    Dried shiitake has more protein per 100 g than the selected fresh entries, but that does not mean a small dried portion supplies more than a larger fresh portion.

    Read the evidence ↓

    Supplement Science Insights Editorial Team

    Published September 23, 2026

    A selected equal-weight comparison

    USDA SR Legacy lists raw white mushrooms at 3.09 g protein per 100 g, raw shiitake at 2.24 g and dried shiitake at 9.58 g. Dried shiitake leads this selected set by equal weight. These three records do not establish the highest-protein mushroom in every species or preparation. [1]

    Water content changes the denominator

    Drying removes water, so an equal-weight dried portion represents a different quantity of mushroom material. These are separate historical records, not a controlled before-and-after drying experiment. Do not infer exact nutrient retention or apply a dried value to rehydrated weight without knowing the preparation. [1]

    A hypothetical portion comparison

    A 10 g portion of dried shiitake supplies about 0.958 g protein, while 100 g raw white mushrooms supplies 3.09 g. That realistic difference in chosen portions reverses the equal-weight comparison. Match the serving to the question before calling one food higher in protein. [1]

    Hypothetical example — calculate specified food portions from historical reference data
    Hypothetical portionProtein estimate
    Dried shiitake,10 g0.958 g
    Raw white mushrooms,100 g3.09 g
    Raw shiitake,100 g2.24 g
    Mushroom protein: fresh and dried weights are different comparisons — original article outline diagram
    Original editorial diagram of this article’s sections; no product photograph or clinical finding is depicted.

    Sources for this article

    1. USDA FoodData Central — SR Legacy April 2018 composition and portion tables
      Source consulted: 2026-09-20. This is a reference resource, not a claim that we conducted the studies or tested a product.