Dried Horsetail: Equisetum arvense Fol tincture, Harvested from a humongous swathe of it near newport Pembrokeshire.
Famous for its minerals and high silica content, it is not recommended large doses over extended periods of time and a few other contractions. A reputable monograph can be found here, by Dr. Marisa Marciano, ND. But if in any doubt contact a herbalist about your situation. National institute of medical herbalists have a helpful 'find a herbalist' page.
