Bacteria that metabolise ammonia - a major component of sweat - may improve skin health and some day could be used for the treatment of skin disorders such as acne or chronic wounds shows new research. Human volunteers using the bacteria reported better skin condition and appearance compared with a placebo control group said researchers after the study. For the study researchers used a strain of Nitrosomonas eutropha -- ammonia-oxidising bacteria (AOB) isolated from organic soil samples. In the placebo-controlled study involving 24 volunteers one group applied a suspension of the live bacteria on their face and scalp for one