There are still holes in the regulatory system here in the United States. And even though by and large, most chemical manufacturers try to use safer ingredients. There's still a lot of ingredients and also combinations of ingredients that can have negative consequences for human health. As well as for the environment. http://www.solvecast.com/articles/detail/15298-impact-of-cleaning-products-on-human-health-in-the-workplace-with-doug-gatlin-ceo-green-seal