I've been using Dr. Pierson's recipe using Nature Made fish oil (http://www.iherb.com/Nature-Made-Fish-Oil-1200-mg-100-Liquid-Softgels/40399?at=0) and just noticed that it contains soy...has it always been added to the oil or have they changed the ingredients? Is there any problem giving cats soy products? Is there any other alternative fish oil you like?