Nitrosomonas eutropha

Nitrosomonas eutropha is an ammonia-oxidizing, Gram-negative bacterium from the genus of "Nitrosomonas".
Starting in 2014, it was being tested by the biotech company AOBiome for its possible health benefits on skin. AOBiome started a Phase II trial of an intranasal formulation of the bacteria for migraines.