More than 95% of the ingredients are minerals, or break down into minerals and components that are readily found in our natural environment. OxiClean® Versatile Stain Remover breaks down into oxygen and soda ash when mixed with ordinary water and uses the tremendous cleaning power of oxygen to remove stains. There are no toxic fumes.The two active ingredients are sodium percarbonate and sodium carbonate. Both are washing sodas, one that turns into hydrogen peroxide, and completely harmless (no toxic fumes). Now, there are two versions of Oxi Clean, the original formula and the "free" version. Oxi Clean free contains no fragrances or dyes, so they must be in the original formula, and while the FAQ page touts the 95% mineral ingredients, It's not clear what the remaining 5% is made up of. It doesn't have the remaining ingredients on the Oxi Clean website or on the packaging so if anyone is familiar with what the remaining makeup is, I'd be curious to know!