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Depends on the quality brand you get. Cheaper fish oils/cod liver oils are very likely to be rancid. Pill form or liquid. I think whole foods sells some refrigerated varieties, but i need to double check on that.
But it's going to do more harm than good if the oil is rancid, and by the time you are consuming the capsule, it's more than likely to be rancid. But again, it depends on the quality of cod liver oil you are purchasing