Citrus Decumana To purchase Citrus Decumana and other homeopathic remedies online, please click the button above. Remedy info unavailable. Citrus Decumana is available to buy through our online shop from WHP in USA, 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 Grape-fruit