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Thyroid SupportIodine SourceMineral SupplementGreat Source of IodineSupports Healthy Thyroid FunctionMay Support a Healthy Body WeightScience-Backed Quality Since 1969Swanson Kelp is a unique formula that helps promote thyroid health. This ocean plant is packed with nutrients and is a rich source of iodine an essential mineral known for healthy thyroid function. Each kelp tablet delivers 225 mcg of iodine.