At Think, they go through a very rigorous process of ingredient and material selection. They don't jump to something, because it is free of a known harmful chemical. It must be well vetted before they will consider use. However, they are also not "married" to any single ingredient or material. If in the course of use, peer-reviewed science emerges of harmful effects of that material or ingredient, they will eliminate it from their use. This is their commitment to all of Thinkers out there.