Daily Supplement. Bladderwrack & Seamoss contains 92 of the approximately 102 minerals that the human body is composed of. Bladderwrack is rich in iodine, calcium, magnesium, potassium, sodium, sulfur, silicon and iron and high in some B-complex vitamins. It contains moderate amounts of phosphorus, selenium, manganese and zinc and small amounts of vitamins A, C, E and G. It also contains anti-sterility vitamin S as well as vitamin K. It is rich in algin and mannitol, carotene and zeaxantin with traces of bromine. Irish Seamoss (carrageenans), sulphur compounds, protein, iodine, bromine, iron, other mineral salts, vitamins A and B1.