Must Lecithin be taken with Oil?

I am taking lecithin to get rid of gallstones and I am wondering if it is necessary for the lecithin to be taken with another oil such as the olive oil/lecithin mixture MH sells, so as to pull out the stones and bile, or can the lecithin be taken on its own and work? Also I know that it is best to take the lecithin on an empty stomach, but I am wondering if it can be taken after eating some food during the evening, I wonder if it helps to digest the lecithin, just some questions.