Knox gelatin(e) is not artificial, and contains no sugar.
It is extracted from animal collagen, a protein substance from bones, skin and connective tissues of animals. The gelatine is extracted by hot water treatment and concentrated.

It has no flavor so can be used in setting up foods and is often used in molded salads and desserts. It is low in calories. Because it has no flavor, it can be used with most juices to make your own "jelly" or gelatin dish.
Knox now has flavored varieties as well as the original unflavored gelatin.

Knox is a trademark, there are other brands.