It really bugs me that they categorize stevia as an NSS. While technically correct, multiple studies have found no negative effects from stevia-based sweeteners. Of course, the opposite is true of many artificial sweeteners, which are well known to be bad for your health.

Sadly, many products marketed as having "stevia sweetener" often contain other ingredients which are bad for you, especially sugar alcohols. It's actually quite difficult to find good brands for products made with stevia-based sweeteners. There are only two brands I know of which I trust.