Shouldn't be a problem, actually.
Yes. Lecithin is a soy product, as are isoflavones, as are many other things... The thing is though that the lecithin part doesn't contain ANY phytoestrogenic compounds. It's safe.
EDIT: In fact, soy lecithin is part of the stuff they remove from the soy when making "soy isoflavones". They then proceed to sell you each as a separate product. At a higher price each than just the soybean would have cost.
Yes. Lecithin is a soy product, as are isoflavones, as are many other things... The thing is though that the lecithin part doesn't contain ANY phytoestrogenic compounds. It's safe.
EDIT: In fact, soy lecithin is part of the stuff they remove from the soy when making "soy isoflavones". They then proceed to sell you each as a separate product. At a higher price each than just the soybean would have cost.