Formaldehyde is a by-product of a preservative added to the products to prevent bacteria growth and extend their shelf-life. 1,4-dioxane is a foaming agent in some products.
Twenty-three of 28 products tested contained formaldehyde. 17 of those products contained both formaldehyde and 1,4-dioxane. According to the Campaign for Safe Cosmetics report,
Johnson's Baby Shampoo, L'Oreal Kids Extra Gentle 2-in-1 shampoo and Pampers Kandoo foaming hand soap contained one or more of what some percieve to be hazardous ingredients.
Sixty Seven percent of the 48 products tested contained 1,4-dioxane. The US Consumer Product Safety Commission claims that even trace amounts of 1,4-dioxane give "cause for concern." Similarly, the Environmental Protection Agency (EPA) and Department of Health and Human Services have both identified dioxane as causing cancer in animals and as a "probable human carcinogen."
THE REBUTTAL: While the amount of these chemical is below current threshold limits, perhaps the threshold is too high when it comes to children. Children are arguably more vulnerable to the toxic chemicals.