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The classic red-and-white "fly agaric" mushroom. Despite the "magic mushroom" association, it contains no psilocybin at all — its active compounds are muscimol and ibotenic acid, which act on the GABA-A and glutamate systems rather than serotonin.

Example: Because it works through entirely different receptors, researchers classify it as a "deliriant" — sedating and dreamlike — rather than a true psychedelic like psilocybin or LSD, and dosing it is considerably less predictable and riskier.