wich supplement is best for IBS (stomach intestens liver pancreas issues?)

I would like to know if there isa supplement wich helps with IBS I used to have like 13 times diarreha a day with a special diet it got way better but I wanna improve it even more what sooths the gut and helps it heal? I take probiotics, milk thistle, magnesium.

what is the best supplement remedy for the gut?