What kind of fish oil will not cause gas and stomach cramps

Patient : My husband has been taking fish oil for years but he use to just buy the cheaper kind over the counter from walmart but he was told to take a better quality and higher amount in the epa and dha to help keep cholesterol lowered.so we went to food health store and bought the barleans brand orange flavor with 370mg of epa and 230mg of dha and we keep them in the fridge..its free of all the mercuries and so forth and suppose to be the all natural fresh catch and so forth but since he has been on this brand he has bad stomach cramps and gas,is this normal or should i put him on on a different brand or lower epa or what could it be..the cheap brand did not do this..i would not think it would be the orange flavor could it?
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