Sometimes wax melts are made using with paraffin wax or heavy chemical compound fragrances or include metal glitters and more. Any or all of these elements can trigger headaches or migraines or irritate breathing conditions. Our wax melts DO NOT include any of these components and we have yet to hear of a customer that has any type of reaction. In fact we have a whole following of loyal customers that can ONLY use our products due to their clean formula. Something we take great pride in !