Usage Cautions Do not apply on open wounds. If irritation occurs, discontinue use. Be careful of sharp edges if the crystal breaks. Do not consume. Do not place on metal or marble surfaces as may stain. Publications: New Scientist, 24 January 04, Are deodorants safe? Deodorants plus shaving linked to breast cancer. USA Research. http://www.newscientist.com/news/news.jsp?id=ns99994587 National Cancer Institute, Antiperspirants/Deodorants and Breast Cancer Date reviewed: 02/04/2003. http://cis.nci.nih.gov/fact/3_66.htm Study by Dr Phillippa Darbre from the University of Reading finding paraben chemicals in cancer tumours. http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=14745841&dopt=Abstract http://www.jsonline.com/alive/news/jan04/199335.asp