Prowise Healthcare Sea Kelp Tablets contain 200 vegan tablets, sustainably harvested from shallow nutrient-rich waters obtained 250ft below the sea's surface without causing harm to the environment. Sea Kelp is the most abundant natural source of iodine. Ingredients: Bulking Agents (Dicalcium Phosphate, Microcrystalline Cellulose), Sea Kelp (Ascophyllumnodosum) 35:1 Extract, Anti-Caking Agents (Magnesium Stearate, Silicon Dioxide).