Taking a vitamin/mineral supplement often does not seem to meet the claims of their intended heath benefits. (See previous post on calcium/vitamin D and bone health.)
Could taking a supplement with food or as part of a fortified food make a difference in the absorption of that specific nutrient rather than merely taking it in pill form alone? That remains to be determined by more research.
The following article covers some important points about nutrient absorption and how combining food sources or even preparation (cooking, e.g.) may make a difference in their combined outcome on health?