Lecithin (E322): Soy, Sunflower or Egg?

Lecithin is usually plant-derived — soy and sunflower dominate industrial supply — and vegan-compatible in those forms. Egg lecithin exists, mainly in specialized and pharmaceutical applications, and shares the same E number. The source is normally stated on food labels as soy or sunflower lecithin; where a label says only E322 or lecithin, the review asks for it.