Perfect for Ketogenic and No-Sugars Diets. Pure, Granulated Xylitol. NOW Real Food Xylitol is the incredible pure sweetener that more and more people are turning to as an ideal substitute for sugar. Unlike sugars such as sucrose and fructose, this sugar alcohol won’t promote tooth decay, has a low glycemic impact and has around one-third less calories than other sugars, making it a low-calorie, diabetic-friendly and keto diet-friendly sweetener that’s hard to beat.