Soy lecithin is an oily substances that occurs naturally in in soybean plants. formula is usually only recommended if a baby suffers from dairy intolerance. If you’re buying non-organic formula, the soy is likely read as soy lecithin. Luckily, organic European formulas use Soy Lecithin that has not been genetically modified. Soy-based formula contains soy protein that is isolated from soybean. It is made from soybean meal that has been dehulled and defatted. Soy formula also contains high levels of plant-derived estrogens (phytoestrogens). In fact, the concentrations of phytoestrogens detected in the blood of infants fed soy formula were shown to be 13,000 to 22,000 times greater than the concentrations of natural estrogens – the effects of this are simply unknown. Unfortunately, even most dairy-based formulas contain soy oils or lecithin.