[Acne] Regular Whey Protein vs Whey Isolate

All,

After doing a bit of research it seems there is a link between Whey protein and acne. Possibly from the insulin / IGF-1(?) I got some Whey Isolate from MyProtein and was curious if anyone had thoughts or experience with Whey Isolate on acne. I've seen it reccomended for lactose intolerance but am curious if it's "acne safe"?

Any thoughts? Or if anyone has any good sources for cheap, unflavored, unsweetened, plant protein (:

-H