MH makes 2 formulas that are 50% liquid lecithin. I've tried both and until I get my liver completely healed am using the one called Liver Cleanse. It's from a soybean source.
People give soy a fit, and probably rightly so with all the genetic modifications there have been. And soy being turned into processed replacement for other, even more natural foods. "If God didn't make it, don't eat it" tells me I'm not drinking soy milk, tofu, etc etc etc. The tasty little roasted soybeans on salad bars have had their nutrition killed in the roasting process ... but the oil of a soybean, lecithin, perhaps that's why God put the things here? He doesn't make mistakes.