Blue agave syrup (also called agave nectar or blue agave sweetener) is made from the blue agave plant grown in Mexico. It is much sweeter than sugar and more healthy because it has a lower glycemic index than sugar. It is similar to honey – being very viscous although it is less viscous than honey plus it dissolves quickly in cold beverages. Depending on how it is processed, it can be light or dark amber in color.
Blue agave syrup is made from the same plant that is used to make tequila (the blue agave plant). In fact, when used as a sweetener in a non-alcoholic drink with lime juice, lemon juice and club soda, it seems to impart some of the unique flavor of a Margarita.