1) Sugar substitute 
Tagatose is a functional sweetener. It is a naturally occurring monosaccharide, specifically a hexose. It is often found in dairy products, and is very similar in texture to sucrose (table sugar) and is 92% as sweet, but with only 38% of the calories. Tagatose is generally recognized as safe (GRAS) by the FAO/WHO and has been since 2001. Since it ...
A ketohexose; d-tagatose is epimeric with d-fructose. ... (05 Mar 2000) ... 
Type: Term Pronunciation: tag′ă-tōs Definitions: 1. A ketohexose; d-tagatose is epimeric with d-fructose.