I don't know exactly what it is but, I am lime crazy! The somewhat sweet combined with the somewhat tart taste is something I enjoy very much. When I spotted this juice I absolutely had to try it. It was excellent. There is certainly an art to making limeade and, the company that makes Simply Limeade has mastered it for sure. The sweetness of the juice is very nicely balanced by the somewhat tart under tones of this citris fruit. Although I can usually quote the exact nature of the nutritional facts a product contains, that is not what is important to me reguarding Simply Limeade. The nutritional factors have absolutely nothing to do with my reasons for initially buying it or, continuation as a enthusiastic customer. For me, it's all about he taste. The sensation that the mix of sweet and tart gives. I absolutely love this stuff. I would definitely recommend it.