Nope, its ok. The salt content is very low, and the vanilla doesnt hurt a thing. If it worries you, you can make your own invert sugar or only add the corn syrup after you turn off the electrode power.
I have stated many times here that the very best colloidal silver is made using sodium carbonate only during electrolysis up to 20 ppm, then adding the reducing sugar and heating afterward. This way you are not electrolyzing the sugar or anything other than the silver. Above 20 ppm you should use maltodextrin or cinnamon instead of corn syrup anyway.