I have heard/read that taking soy lecithin can help with milk flow, for example in women who have recurrent problems with blocked ducts. I can't eat soy products right now, but I'm having problems with the same duct getting plugged and backing up all the way to my upper chest. Does anyone happen to know if sunflower lecithin has the same effect? Or if there are any other types of lecithin that do? What is it about soy lecithin that helps?