(Oops.When I first posted this reply, I didn't see that you wanted to add only non-fermentable sugar to your beer. Yes, lactose would do the trick, if you want to add that sort of dimension to your beer. Lactose won't make your beer taste like milk or yoghurt; it's just a disaccharide composed of galactose + glucose. The bond between the molecules is what makes it untouchable for brewer's yeast.)
My original reply:
I assume you want to bottle/keg condition your beer? Otherwise, there's no reason to add anything to it. Residual extract doesn't contribute to mouthfeel or body and takes away from the crisp refreshing flavor of the beer. Therefore, most brewers want to achieve a high attenuation. Adding sugar will make your beer more attractive to other microbes. The only problem with an overly high attenuation is if the yeast didn't do all the fermenting. How does your beer taste?


Reply With Quote
When I first posted this reply, I didn't see that you wanted to add only non-fermentable sugar to your beer. Yes, lactose would do the trick, if you want to add that sort of dimension to your beer. Lactose won't make your beer taste like milk or yoghurt; it's just a disaccharide composed of galactose + glucose. The bond between the molecules is what makes it untouchable for brewer's yeast.)