The answer depends on your main symptom. Soluble fiber like psyllium helps constipation and loose stools, enteric-coated peppermint oil eases pain, and the right probiotic strain calms bloating. Think of IBS supplements as tools in a toolbox. A hammer will not fix a leaky pipe. In the same way, a fiber powder will not stop cramps, and peppermint oil will not firm up stool. The right tool for the job saves you time and money.