Note: always speak first to your doctor or healthcare specialist before you apply henna if you have cancer, are being treated for cancer, or are a cancer survivor on cancer-treatment medications. That being said, henna is a great natural alternative for the individual looking to steer clear of nasty chemicals and keep all toxins out of their system. A terrible fact is that many traditional synthetic hair dyes do contain nasty chemicals that have been linked to the development of certain cancers. Our products contain NO irritating, synthetic chemicals. All plant-based, organic, and natural.