I've never had fishy burps after the cholesterol free fish oil capsules. However, I've lately been wondering about them. In "Protein Power Lifeplan", the Eades write that the capsules can easily become rancid. They suggest either using cod liver oil or tasting a fish oil capsule every few days and throwing out the bunch if it's rancid. I tried the orange flavored variety of "Dale Andersons" brand of cod liver oil. Getting it down was no problem but I burped fish for three days afterwards. Since I absolutely detest fish this was not an experience I'm willing to undergo again. So am I stuck with flax seed? I guess I'm really more partial to fish extract on a philosophical basis, even though I don't want to eat a whole fish (so no sardines for this ungulate eater). Does anyone have any thoughts on the rancidity issue with fish oil capsules? Does Carlson's cod liver oil make you burp fish? I'm also concerned about cod liver oil and contaminants. I was under the impression that the processing that removes the cholesterol from fish oil capsules also removes most pollutants the fish may have ingested. What type of processing does cod liver oil go through? Julie ("Here fishy fishy, I want your oil but not you...")