Atkins/Sweet Whey Powder

[Lynn CC]

Is sweet whey powder allowed on Atkins. I don't know what it is, but it's an ingredient in a sauce. Wouldn't want to eat something that has sugar in it.
Is this one of those hidden sugars?

 

[Rhonda]

I use whey powder in different recipes, but I've never heard of "sweet" whey powder. Are there ingredients listed on the back of the container?