So Grandma gave me some of this from her herb groups. Xylitol is a sugar substitute. I've used Splenda before, but it is quite a pain to bake with, even using their specific recipes. Like these Molasses cookies. Last time I made them, they did not rise...I had to do them like refrigerator cookies. AGH!!
But this actually rose really well! I used about 1/2 the amount that was sugar and this came out pretty well. I did mini zucchini loaves and then sour cream loaf.