Hi Sabs. Thats a shame you have trouble with soya because the Liver Support by Xandria Williams I have found is a good supplement. I have just checked my label and it doesnt say from what source the lecithin is actually from so I am sorry I cannot be of more help.
What about trying Livertone Plus by Dr Sandra Cabot? Thats another good and comprehensive liver support. I have just checked my label and I can see no mention of lecithin as an ingredient. I maybe wrong but I think she does another supplement just called Livertone and that does contain lecithin. Livertone Plus is also available from the Nutricentre at a similiar price.