Andy
Retired committee member
"Psychobiotics" 

https://www.news-medical.net/health/Gut-brain-axis-and-psychobiotics.aspxIncreased amounts of “good bacteria” in our intestines are being associated with the ability to curb inflammation, reduce cortisol levels, lower stress, alleviate symptoms of anxiety and depression, improve memory, and even lessen social anxiety.
This demonstrates that beneficial intestinal bacteria (even in the form of probiotics) may function as vehicles to deliver neuroactive compounds, forming in turn the gut-brain interaction called the gut-brain axis. This has given rise to the term ‘psychobiotic’, which represents a live organism that, when taken in appropriate amounts, provides certain health benefits for patients with psychiatric illnesses.
---------
Altering the ratio of anti-inflammatory to pro-inflammatory cytokines has been proposed to be an effective mechanism of psychobiotics. Bacillus infantis and Lactobacillus casei were shown to possess the most beneficial effects, especially in patients with chronic fatigue syndrome.