Cetrararia Islandica To purchase Cetrararia Islandica and other homeopathic remedies online, please click the button above. Remedy info unavailable. Cetrararia Islandica is available to buy through our online shop from Boiron in USA, Boiron in Canada, Weleda in UK (not for export), by clicking the red 'View Purchase Options' button. Alternative names, keywords, and common mis-spellings Cetraria Islandica, Iceland Moss