http://www.naturalingredient.org/pledge.htm
" Made with Natural Ingredients/Made from Natural Ingredients Products labeled as "Made with/from Natural Ingredients" must contain at least 70% natural ingredients that meet the NIRC Criteria. The remaining 30% may come from ingredients that do not meet the NIRC Criteria for natural, however, products that include synthetic fragrances, artificial colors or ingredients from petrochemicals MAY NOT display the NIRC "Seal". All percentages are based upon weight."