I feed the mulberries to my iguana as well as my bearded dragon and blue tongued skink. The are a welcome treat but they should not make up a sizable part of the diet. And be VERY sure that they haven't been sprayed with anything.
Odds are against you / us in finding Ca/Phos. ratios for leaves and random greens that we want.
I have never mixed the leaves into Bob's salad but I have watched him munch on some while climbing a small M-bush.
Look around and there will be smaller wild bushes growing, these are great things to climb in. Once when letting Bob climb in one he started up the main branch and got to a point that any further "up" the branch he went the further it drooped, he got to the point where he mor or less stepped from the branch onto the ground.
In my quick search I found one site that listed it in the daily greens salad, (reptileParadise.com).