Image Tagatose Minimize Calories. Maximize Flavor. Image The Sweet Summary: Tagatose Overview Looking to formulate for lower calories? Tagatose is a rare sugar that is 90% as sweet as sugar with 60% fewer calories. Our testing shows products containing Tagatose are nearly identical to their sugar containing counterparts in taste, appearance and texture. Discover Tagatose Image Tagatose is naturally found in dairy and fruits.