It is a licensed medicine that is specifically formulated to soothe and effectively treat nappy rash. It also works as a waterproof, preventing urine and faeces irritating a baby's skin. Its active ingredients include Titanium dioxide 20% w/w, Titanium peroxide 5% w/w and Titanium salicylate 3% w/w. It's also lanolin free. Lanolin can result in an allergic reaction in some people, so Metanium is suitable for babies who may be prone to allergic reactions to it.