Alginate does not inherently contain iodine. Since it is derived from seaweed, it is possible for the seaweed to absorb iodine in the water and pass on trace amounts to the alginate. Our raw material is tested periodically for iodine and may contain up to .01mg per 1g of alginate. There are 950mg of alginate per serving of Khelp, so it's possible there is just under .01 mg per serving. We test rigorously for heavy metals at several points throughout production. Upon arriving at our facility, every raw material is initially quarantined before undergoing testing for purity and heavy metals. Once approved for production, materials are stored in our facility and overseen by the Quality Assurance team. The product then goes through three additional quality tests before being approved to leave the facility. Khelp meets all USP (United States Pharmacopeia) standards.