Egg yolks have lecithin, enough to nullify all the cholesterol that are in the same yolk, plus more. However, it is not the main source of lecithin, which is derved from soy beans. Soy lecithin is available as dissolved in soy oil, or as a granular material when the oil is removed. You will find that lecithin is a great food substance, naturally occurring, and supplied also as a refined concentrated additive.
Except anything soy will turn you into Chelsea Manning or Bruce Jenner.