Wounds cannot heal without oxygen. In fact, healing wounds demand more oxygen than healthy tissue — yet chronic wounds are often at least partly due to vascular insufficiency. A novel spray aims to make use of haemogolobin, the transport molecule for oxygen in the bloodstream, to bind atmospheric oxygen and deliver it to the hypoxic wound bed. The product, Granulox® (Infirst Healthcare), may be of particular interest in patients with impaired levels of tissue perfusion/oxygenation, which may be impeding wound healing.