Oxidation processes often start at the product surface, through light activation, and/or through the availability of oxygen. It makes sense to create a reservoir of antioxidants at the surface, which releases the antioxidants slowly to the product. Ultraviolet quencher or chelating agents (e.g. EDTA) that reduce the risks of oxidation of components in the product Enzymes such as catalase may be incorporated that remove strongly oxidising components, such as peroxides.