I personally don't agree with lecithin. It comes from Soy and soy is some nasty stuff. So I don't advise people take it. Soy slows thyroid function. Barefoot is a big advocate of soy lecithin so you may want to ask him.
I don't like or advise anything from soy except fermented soy which is where natokinase comes from. Of course the fermantation process does its work and the soy used is not processed at all. Read http://www.thedoctorwithin.com
about soy.