Question: What is the best vitamin or any other treatments for IBS sufferers? 

Answer: Drink plenty of water.  Add fiber to your diet - prunes, apples, oat bran, and carrots are good.  During an attack, peppermint oil extract helps.  You can get capsules or pills that are enteric coated.  0.2 millimeter of peppermint oil is recommended.  Drinking peppermint tea can also be soothing.  Try to asses what foods trigger attacks and avoid them.  You can get a supplement called Robert's Formula at health food stores that also may help.  Stress can also trigger an attack so do whatever you can to keep your stress at a minimum.  Take time for yourself - it will keep you healthier.
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