Phosphorus didn't help me with UC (but may help you so). My current homeopath doc says he never prescribes one substance alone (as he saw the list of the single-substance homeopath medicines I used in the near past, such as Sulphur, Thuja, Collinsonia, Mercurius, Sorinum and many other). I don't even know if the spesific substance, used in this homeopath medicine of Arum maculatum, represents all substances found in the bulb itself.But I insist on your giving a try to the horsetail herb now (if you find it).The author of this book I have found about horsetail herb is Maria Treben (you could find some information in the net.