When I buy flaxseed oil, I have ...

When I buy flaxseed oil, I have a choice: with or without lignans. I almost always choose without. Apparently that’s the right choice, witness this from the SLD forums :

I’ve been trying to figure out what besides overeating might cause these flare ups with my gallbladder. It seems clear from the last few days that one of the things that can set it off is Flax Seed Oil with lignans. When I consume 2-3 tablespoons a day of FSO without lignans, I don’t notice any problems. The FSO goes down easy and I don’t feel nausea or pain. But with the lignans I often do. To be sure, I decided to switch from FSO to ground up flax seeds mixed into my oatmeal. And today, the first time I tried that, an hour later the familiar nausea is back.