I was really surprised when I learned that Johnson's Baby Shampoo has two strikes against it for health and safety.
One is that it is using Quaternium-15 a preservative that emits formaldehyde as it degrades, and the second is that it contains > 4 ppm of dioxane. It should be pointed out that dioxane, a carcinogen, is not dioxin. Dioxin is the short name given to chloronated dibenzodioxins which are very toxic, but not very similar to dioxane, but it sounds similar.
Susan Nettesheim from J&J says that there are only tiny amounts of formaldehyde and dioxane in the product, and that they will try to get rid of the problematic preservatives. I know that in polymers the industry has been switching away from these preservatives for years, and that J&J is behind the curve, although the replacements might be too irritating for a baby shampoo. J&J promised advocacy groups to do this.
In the meantime, I am going to continue using the Johnson's product, though I am worried about Quaternium-15. I have no way of finding out which products have it, and which don't.