NOW Foods Xylitol is a 100% pure, birch-derived sugar alcohol that provides sweetness equivalent to sugar with 40% fewer calories and a negligible effect on blood glucose and insulin — making it an excellent sugar substitute for diabetics, low-carb and keto dieters, and anyone reducing sugar intake. Xylitol's most notable additional benefit is its active protection against tooth decay: oral bacteria cannot ferment xylitol for energy, and regular xylitol consumption actually inhibits Streptococcus mutans colonization and reduces dental plaque formation. This is why xylitol is used in dental chewing gums, mouthwashes, and toothpastes. NOW Foods sources xylitol from non-GMO birch trees and provides it in pure crystalline form — suitable for baking, beverages, and cooking wherever sugar would be used. Not suitable for pets, particularly dogs, for whom xylitol is toxic.