Again, I grabbed this from Target.com. A single Nuun table has 10 calories–the primary sweetener seems to be Stevia. So it has zero sugar and, from what I can tell, no artificial ingredients.

Hyundai Department Store Group subsidiary healthcare company Hyundai Bioland announced on the 3rd that it will launch the electrolyte drink 'Nuun' from Nestlé Health Science in Korea.