Carcinogens in Shampoo and hair colouring

I have only recently come across this site and I would like someone who is honestly knowledgable about the subect to tell me and everyone else exactly which ingredients in shampoos , conditioners and colourants are CARCINOGENIC. And carrying on from this point which are the safest and best shampoos etc. to use for the best results. We all want our hair to look special but not at the expense of cancer!! Tweet