The Role of Probiotics in Mental Health

"The microbes in the gut can release neurotransmitters into blood that cross into the brain and influence brain function. They can release hormones into the blood that again cross into the brain. They've got a lot of tricks up their sleeve," Stephen Ilardi, PhD, clinical psychologist at the University of Kansas.

https://www.medscape.com/viewarticle/958764?spon=12&uac=392623PN&impID=3645958&sso=true&faf=1&src=WNL_mdpls_210917_mscpedit_psych