If they have FOS (fructooligiosaccharides) in them, then yes, as they are a fodmap. If I eat something that triggers my IBS, I eat nothing but chicken and rice for 2-3 days and everything calms down. If you've been eating a normal diet it would take longer to calm down, but I would have thought you;d notice a difference within a week.
Jarrow Formulas Ideal Bowel Support probiotics are good for IBS, as they have potato starch in them, not FOS.
No Artificial Colours, Flavours or Sweeteners. No Preservatives. No added Sugar or Salt. No Starch, No Corn, No Milk, No Lactose, No Soya, No Gluten, No Wheat, No Yeast, No Fish, No Porcine. Advisory information: