Is blue-green algae safe to drink in juice?

I've heard a lot of good and bad things about this "supplement" that's found in pills and juices. I recently saw in in one kind of Naked Juice. They say it's non-toxic, and the species is Aphanizomenon Flos-Aquae. I googled this and found even many algae of this species to be toxic. Is there significant research that this is safe, or is there still unknown danger about consuming it even though it has the FDA approval?