Hi mattressnightmare,
Post #2 here and the more detailed posts and information it links to have more information about safe, natural, organic, “chemical free”, and green mattresses and mattress materials that can help you sort through some of the marketing information and terminology that you will encounter in the industry and can help you differentiate between them and decide on the types of materials you are most comfortable having in your mattress and help you answer “how safe is safe enough for me”. These types of issues are complex and are generally specific to each person and their individual sensitivities, circumstances, criteria, and lifestyle choices.
Once you have decided on the types of materials you are comfortable with then it’s much easier to focus on choosing a mattress that only contains those specific materials.
Phoenix