What brands do you have (some are better than others)? You need a quality phosphorus-free calcium without D3 every feeding, a quality phosphorus-free calcium with D3 once every two weeks, and a quality multivitamin without D3 (preferably with preformed Vitamin A in it) once every two weeks. Or use the calcium without D3 every feeding and use a multivitamin with D3 (preferably with preformed Vitamin A in it) once every two weeks.