Buggies grow in water.. That's why many whipped butters don't contain preservative, they normally don't need it. Anything with water, and adding certain elements, such as milks, honey, proteins and aloe (and a zillion other things) make it even more prone to grow bacteria, yeast, and mold. Anything can get moldy, I'm just making a choice that is supposed to lessen the chances. Just try it with the water...