Unlike some places famous for their bath bombs, I don't use harsh chemicals to make them foam. Other famous places use SLS (Sodium Lauryl Sulfate); which can cause skin irritations and is used in household cleaners (think strong carpet shampoos!). My bath bombs do foam but, I use an ingredient derived from coconut and palm oils and conforms to Ecocert's natural and organic standards. It is 100% of natural origin. Why do other companies use harsh chemicals instead? Simply because they are so much cheaper.
I also only use natural, therapeutic grade essential oils; not synthetic fragrances like those other places. This makes my bath bombs not only smell amazing, but actually therapeutic for you, as well.