What are your thoughts on probiotics?

[gadje]

So my son was having some depression / anxiety issues after covid lockdown. He also got stomach pain at the same time. A gastro specialist recommended probiotics. That solved the stomach issues, but interestingly, it also had a positive effect in his mental health. If we forget to give him probiotics for a few days, wife swears that she noticed some mild signs of depression and anxiety returning. We make sure we give him probiotics on a daily basis and it seems to work.

I am not a medical doctor and YMMV.