I feed my guys crickets, earthworms, dubia roaches, and mice.
I dust all the above with calcium without D3 every other feed. Dust with calcium with D3 every first Saturday of the month. Dust with multivitamins every third Saturday of the month.
This is the multivitamin I use.
Reptile Supplies - HERPTIVITE Multivitamin for reptiles and amphibians (3.2 oz)