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Both edible mushrooms (champignons, shiitake, Mushrooms (like oyster mushrooms) and psychedelic truffles are fungi (Basidiomycota, Agaricomycetes, Agaricales), but belong to different families. Edible species contain identified allergenic proteins (such as MnSOD and mannitol dehydrogenase in button mushrooms, trehalose phosphorylase in oyster mushrooms) with which IgE-mediated reactions can occur. Multiple cases have been reported in the literature, ranging from a mild oral reaction to urticaria and even anaphylaxis after consumption of button mushrooms or oyster mushrooms. Shiitake allergy (IgE-mediated) is very rare – until recently, no Western case had been described. Mushroom allergy is often associated with cross-reaction to inhaled fungi (mold), which can lead to sympathetic reactions (PFAS) with uncooked mushrooms.
Much less is known about psychedelic truffles. No specific allergens from Psilocybe sclerotia have been described, and no case series of food allergy has been found. One anecdotal report concerns an anaphylactic reaction to a “psychedelic mushroom”. Based on general allergy principles, it is recommended carefully to be: treat every psilocybin-containing species as a potential novel allergen. The AAAAI guidelines emphasize that psilocybe products should be tested separately (skin prick or fresh skewers) and that an oral challenge should only be performed under strict supervision if the test is negative. A clear distinction must be made between a genuine allergic reaction (urticaria, itching, swelling, shortness of breath) and the expected hallucinogenic effect of psilocybin. Specifically, this means that someone with a mushroom or mold allergy cannot simply assume they can tolerate sclerotia; there is no free pardon. Since there are no detailed studies, the advice is: remain cautious and consult an allergist if necessary.
| Aspect | Edible mushrooms (e.g. button mushroom, shiitake, oyster mushroom) | Psychedelic truffles (Psilocybe sclerotia) |
|---|---|---|
| Biological classification | All fungi (Basidiomycota, class Agaricomycetes, order Agaricales). Examples: mushroom Agaricus bisporus (family Agaricaceae), shiitake Lentinula edodes (Omphalotaceae), oyster mushroom Pleurotus ostreatus (Pleurotaceae). | Also fungi from Basidiomycota, Agaricomycetes, Agaricales: the sclerotia (“magic truffles”) are of Psilocybe-species (e.g. P. mexicana, P. tampanensis), from the family Hymenogastraceae. |
| Known allergens | - Mushroom (A. bisporus): A manganese oxidase (MnSOD, ~24 kDa) and an NADP dehydrogenase have been identified as allergens. Oyster mushroom (P. ostreatus): In one case, trehalose phosphorylase (±160–170 kDa homodimer) was found as an IgE-reactive protein. Shiitake (L. edodes): no specific currently recognized food allergen; IgE reactions very rare. Only recently was the first Case of urticaria after shiitake ingestion reported (without identification of the specific protein). | None known |
| Reported allergic reactions | Depending on the patient, can mushrooms give varying reactions: from mild (oral allergy syndrome, itching/swelling in the mouth and throat area) to severe (urticaria, anaphylaxis). For example: a patient developed generalized urticaria and anaphylactic shock after eating mushrooms. Oral complaints (“pharyngitis” with raw mushrooms) have also been described. Urticarial reactions have been reported for oyster mushrooms in any case. In general, the spectrum ranges from oral complaints to anaphylaxis. | There are no No clinical cases or studies were found regarding allergy to Psilocybe sclerotia itself; the literature on this is very limited. However, one anecdotal report is known: a patient reported anaphylaxis at a younger age (15 years) after eating a “psychedelic mushroom” (without details about the species). Furthermore, there are no published cases of OAS, urticaria, or anaphylaxis after psychedelic truffles found. |
| Cross-reactivity | Cross-reactions between mushroom species and with respiratory fungi have been described. For instance, homologous allergens have been found between button mushrooms and Aspergillus/Alternaria. In skin tests, multiple mushrooms sometimes react simultaneously (e.g., in one patient, portobello, shiitake, porcini, and button mushrooms all reacted positively). A recent study shows broad cross-reactivity in skin tests between oyster, king oyster, shiitake, and other oyster mushrooms. Specifically regarding edible vs. psilocybe: No research is available. It is assumed that similar fungal proteins are present, but effective cross-reactivity is unknown. Allergologists recommend every kind apart to test (so psilocybe separate from edible species). | Not investigated in literature. Because all mushrooms are basidiomycetes, be able to Theoretically shared allergenic proteins exist (e.g., enolase or superoxide dismutase). In practice, it is unknown whether someone with a mushroom allergy reacts to psilocybe. The AAAAI expert therefore advises testing psilocybin mushrooms individually: a skin test and/or challenge per species, rather than assuming a cross-reaction. |
| Medical/safety advice | For known mushroom allergies, the general rule is: avoid the offending species. Mushroom allergy is treated like any food allergy (skin test, IgE determination). There are no standard guidelines specifically for button mushroom, shiitake, or oyster allergy, but identification of cross-reactions with inhalation allergens (MOLD) is important. | Specifically for truffles: Allergologists advise caution regarding mushroom allergy. An expert recommends a skin prick test (with a fresh mushroom) for each psilocybin source separately, followed by an oral provocation test under medical supervision if the test is negative. In doing so, one must guard against confusion between the hallucinogenic effects (psilocybin) and an allergic reaction. An existing allergy to environmental molds does not change the plan. In summary: treat truffles as new food allergens – test them individually for oral challenge. |
Posted : 18 June 2025 21:09