I already have some pure calypso calcium powder for my other reptiles and I also have a multi vit by euro rep which is called repton insect dusting suppliment. Could those be used to dust the veg?
I would hesitate to use a dusting powder for insects because it is made to supplement a reptile that eats insects. Since your tortoise doesn't eat insects, it might be the wrong mixture of vitamins and minerals.
By the way...what kind of tortoise are we talking about here?
I agree with the Repcal, but I use it daily. I think that no matter how hard we try a captive diet is always lacking in something, so I just use the Repcal daily and lightly sprinkle it over the food. I also use TNT 3 times a week.