An expert in stem cell treatment is warning of dodgy operators in New Zealand offering unproven and potentially dangerous treatments. A recently released scientific paper documented a case of three women in the United States who were blinded by an experimental treatment for macular degeneration. In New Zealand, stem cell therapy is not regulated by the Ministry of Health because stem cells are not considered medicine. Nine to Noon speaks to Dr Bronwen Connor, who teaches at the Auckland Medical School and is an expert in stem cell therapy.