Urban Fuel Sea Kelp - 365 Iodine Tablets. Ingredients - Per Tablet: Kelp 500mg (Fucus vesiculosus) (Algae) (from 14.3mg of 35:1 extract) Standardised to contain Iodine 22.5μg. Inactives: Dicalcium Phosphate, Microcrystalline Cellulose, Magnesium Stearate & Silica.