Some herbs, minerals, toxins and metals used in Ayurveda for the treatment of diseases can produce side-effects. However, all the substances used in Ayurveda are purified and detoxified before use. If the process of purification and detoxification is not done properly, then the final product can produce some side effects. Similarly some toxic substances and oxides of minerals and metals, if not used in proper dosage, may also cause some side effects.
This answer was provided by: Indus Valley Ayurvedic Center