You are going to want
Pure Calcium Carbonate- I use T REX Bone Aid powder
For a multivitamin I use either
TREX Leopard gecko dust,
Or Reptivite Multivitamin with D3
I use those once a week for babies/juvies and twice a month for Adults.
Its always easier to buy a multivitamin that has D3 in it, than buying 3 different bottles.
EDIT: Either of these
http://www.reptilesupply.com/product...roducts_id=153
Or
http://www.reptilesupply.com/product...roducts_id=235