Mycobacterium vaccae, seems to have the ability to trigger our serotonin production, effectively making us happier and more relaxed. M. vaccae occurs naturally in soil and water, and is inhaled or ingested when we come in contact with dirt. Our exposure to mycobacteria has decreased considerably due to sanitation and water treatment in Western urban areas, but by regularly playing outside or helping out with a backyard garden, children can still get in contact with it. A recent study on mice also revealed that M. vaccae can improve cognitive functions, like learning.
