Yea, I say d3 should be limited significantly to once a month. Thats what I would do. I'm using mvb's so its very rare when I give d3 for my bearded dragon. But my cousin Jake has his beardie on the same zillas desert lights, so I'm guessing they give off enough uvb to process calcium because he gives his beardie d3 once a month like I said.
I wish there would be like a universal care sheet that everyone could agree on and go by since one always ends up getting confused about these things again and again.