Use calcium without D3 everyday, Calcium w/ D3 twice a month, and Multivitamin twice a month.
I use Calcium W/D3 the first sunday of the month, then second Sunday i follow it by using Multi Vit, third Sunday W/ D3, And so fourth...
All my supplements are from Rep-Cal. I use Calcium w/out D3, Calcium w/D3, and Herptivite Multivitamins.