Scientifically known as Ascophyllum nodosum, these tablets are a rich source of iodine, providing 150mcg per serving. Experience the natural goodness of UK-made Sea Kelp Tablets 500mg. 1 tablet provides 500mg kelp standardised to yield between 300µg and 495µg iodine (200% to 330% NRV) NRV = Nutrient Reference Value Ingredients: Ascophyllum Nodosum, (cellulose, maltodextrin, dicalcium phosphate, Starch), (silica, magnesium stearate).