Do probiotics help IBS?

just wondering if one of these might help this condition. And if they do, which one is the best one to buy

I have eaten Activia and DanActive for years with no result I can see. Best thing I ever found for IBS-D is taking a tablespoon of 'Maria Treben's Authentic Swedish Bitters' first thing every morning, and a shot glass of 'Green Chartreuse' every evening. That routine has cut down the IBS-D attacks from four times a week to about once every ten days.