This is a copy paste from my blog for new keepers of veileds. You might find it helpful. I'm linking it below.
The feeders have to be "lightly" dusted with 2 kinds of supplements. When your chameleon is young you will use plain calcium (no d3) at just about every feeding...... if you skip one or two days a month that's ok. You will also need Reptivite with d3 twice a month. You can see pictures and buy these supplements here: http://lllreptile.com/store/catalog/...-and-vitamins/
An adult male chameleon will not need nearly as much supplements. If your Cham gets allot of outside time and you feed a large variety of well gutloaded feeders, he may not need any calcium or D3 at all, just a multivitamin without D3.