If you want you can use the Repashy Calcium + (LOD version). You can dust this on your feeders a couple times a week. its calcium and vitamins all in one. You should still do your regular calcium supplement daily/every other day.
This is just an alternative, you can still dust d3 2x a month and multivitamins 2x a month if you want. But what I have noticed is a lot of experienced cham owners are using Repashy Calcium +, this is all preference though, I know the rep-cal brands are still good too.
Look at Sandrachameleons food Diary's for her chameleons(blogs), read her other blogs too. This will give you a good idea of how to supplement if you gutload well.
A lot of people on this forum trust her knowledge.
Hope this helps a little, I was totally confused until I did tons of research.