I have been taking 2 grams of Nature Bounty fish oil for more than a year. About two months ago I started getting diarrehia every 2 weeks, like clock work only for a day. I do have IBS but having the D is not common for me, just loose and frequent B M 's.
Could the fish oil cause this, I am thinking it would be a every day occurance if it was the fish oil and why start after all this time.
I do get colonostopies, the last one was 10 months ago just a small polyp found and none necessary for 5 years.
Myofascal pain syndrome
Arthritis, cervical and thorastic
Thing about fish oil is, it goes rancid very easily. Any chance it was improperly stored before you took it? If it's a liquid, it needs to stay in the fridge. If it's capsules, the capsules need to stay cool and dry.
I have taken fish-oil (OMEGA 3) in liquid form for many months and have never found it to cause Diareah and I have IBS.
Also I have never kept it in the fridge and it has never turned rancid. I checked the bottle and there is no mention of keeping it refrigerated.
I would say the Diareah is more likely connected to your IBS or your diet, try keeping a record of what you eat at the times this happens.
I wish you well,
I take Krill oil capsules. The recommendation is not to keep it in the fridge as this could cause degradation. I keep mine in a dark cool cabinet. That said, I think not using the product by the expiration date could cause rancidity, but I also second that the oil is probably not what is causing your diarrhea.