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Costus oil is LIKELY SAFE for most people when taken by mouth in amounts found in foods. Costus root is POSSIBLY SAFE for most people when taken by mouth, appropriately. However, costus often contains a contaminant called aristolochic acid. Aristolochic acid damages the kidneys and causes cancer. Costus products that contain aristolochic acid are UNSAFE. Don’t use any costus preparation unless lab tests prove it is free of aristolochic acid. Under law, the Food and Drug Administration (FDA) can confiscate any plant product that it believes contains aristolochic acid. The product won’t be released until the maker proves it is aristolochic acid-free.
Pregnancy and breast-feeding: There is not enough reliable information about the safety of taking costus if you are pregnant or breast-feeding. Stay on the safe side and avoid use.
Allergy to ragweed and related plants: Costus may cause an allergic reaction in people who are allergic to the Asteraceae/Compositae plant family. Members of this family include ragweed, chrysanthemums, marigolds, daisies, and many others. If you have allergies, be sure to check with your healthcare provider before taking costus. *
