I have always concidered this channel serious, but they are making very bold claims.
https://www.youtube.com/watch?v=T3Ftj5E90tY
50% of our dopamine and 90% of our serotonin is created by microbes in our guts.
Is this true and could someone put this into context? Like, what's the difference in a person if they have half the dopamine and 1/10th of the serotonin? Would this be the effect if you removed the microbes?