Swanson Irish Moss is a plant-based source of free-radical-fighting antioxidants that support immune health and thyroid function. Irish moss is a type of sea moss, also known as red seaweed, a source of carrageenan that helps promote overall well-being. It can also support healthy hair and skin and promote healthy aging. Each serving delivers 400 mg of Irish moss in convenient capsule form so you get all of the benefits without any of the taste.