Pearl, coral, conch and other shell ingredients are processed using traditional ayurvedic methods that incinerate the minerals, converting them to a fine powder. During the incineration process, the allergen properties, if previously present, are destroyed. The process involves many steps of purifying the original materials. Because of the processing, a customer who is allergic to shellfish shouldn’t have any issue using one of the products containing shell ingredients. But it is always best to be cautious and alert to any symptoms when first trying the product. To date there is no negative feedback.