well what i've been told/what i did was i fed him a day after i got him, and i dust 1/2 the food i give him with the calcium and 1/2 of his food with a multivitamin.
edit: i also use the rep-cal suppliments, i've heard very good things about them.
this is the multi i use
http://www.petsmart.com/global/produ...N=2030052&Ne=2