What are the side effects of mushroom supplements?
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                            When taken by mouth: Reishi mushroom extract is POSSIBLY SAFE when taken appropriately for up to one year. Powdered whole reishi mushroom is POSSIBLY SAFE when taken appropriately for up to 16 weeks. Reishi mushroom can cause dizziness, dry mouth, itching, nausea, stomach upset, and rash.. 
                    
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