The APOrtha® iodine capsules contain only 100% natural iodine from knotty kelp powder (Ascophyllum nodosum) and bladderwrack extract (Fucus vesiculosus) in combination with high-quality chlorella algae powder. With only 2 capsules you cover 100% of your daily iodine requirement. Iodine contributes to normal production of thyroid hormones and normal thyroid function.