Irish Moss is a highly nutritious plant which contains high levels of Vitamins A, E, F, and K as well as calcium, potassium, sulfur, and iodine. Irish Moss became popular historically during the Irish Potato Famine due to its high nutrient density becoming more important than its less than stellar taste as a food, and is now becoming popular again for use in supplements as a nutrient dense superfood.Our Irish Moss Extract is a nutrient dense extract from the moss itself causing a high concentration of nutrients in each capsule. Double Wood s Irish Moss Extract is a great natural alternative to synthetic multivitamins.