I use the following:
Komodo cricket dust (calcium only) at every feed.
Repashy calci plus twice a week (calcium with d3 and multi vit) but Simba is only getting artificial UVB and isn't getting any real sunshine with the weather being the way it is in the Uk as u know lol. In the summer, when he can hopefully get outside for some real UVB, I'll reduce this to once per week.
Preformed Vit a drop -1 x TINY drop from human grade vit a capsule twice a month on the back of 1 feeder.
I also gutload all feeders well.
Hope that helps