Are there any harmful effects of mushrooms? When prepared properly, there are no side effects of mushrooms. Having said that, there can be some gastrointestinal issues if you are not careful while cleaning them. Spoilt mushrooms can also lead to issues like nausea, vomiting, stomach cramps and diarrhoea. Mushrooms Available in dry and powdered form. For pricing contact us for more details Know more about Mushrooms. Mushroom training available. Mushroom spawn available. Start your commercial mushroom farm with our guidance. For more information contact 9923806933, 9673510343