NaturesPlus Icelandic Kelp Natural Iodine Supplement from Kelp, Gluten Free 300. Important information Ingredients: : Iodine (from kelp) . 150 μg . 100% Norwegian Kelp . 150 mg . † *EC Recommended Daily Allowance †No Recommended Nutritional Intake (RNI) has been established. Ingredients: Bulking agent (microcrystalline cellulose), kelp, lubricant (stearic acid), vegetable cellulose, bulking agent (di-calcium phosphate), lubricant (magnesium stearate), alfalfa, anti-caking agent (silica) and glazing agent (pharmaceutical glaze).