Cod Liver Oil I found this forum on searching for hair loss and flax seed oil. I get extreme and rapid hair loss if I take cod liver oil or flax seed oil. I've read that it's something about them being PUFAs - polyunsaturated fatty acids. I have a thyroid problem so perhaps this has something to do with why I lose so much hair on them. I've also tried taking the whole flax seed (in flax seed crackers) but still get the hair loss. I've had a few bouts now over a number of years - the most recent being when I decided to make the flax seed crackers as the consensus seemed to be that it was the oil in isolation, not the whole seed, that was the problem. Once the hair loss gets triggered, it happens quite rapidly and then takes about six months to grow back. It took me a while to make the link because I'd always thought cod liver oil was a health food/tonic - but it happens even with good quality cod liver oils. I think taking traditional Chinese herb formulas helps with regrowth but I'm not quite sure. I think also having good iron levels might help me as I know this can be an issue with hypothyroidism and Hashimoto's (thyroid autoimmune disorder).