Synergistic Supplements

Does anybody know a couple combinations of synergistic (1+1=3) supplement stacks? The infomation would be greatly appreciated.

Bill Roberts claims that the two ingredients in Mag-10 are synergistic rather than additive.

Ribose and creatine might be another.

This is pretty broad question, as there are a lot of supplements out there that can be used for a variety of different purposes (both specific [optimizing T, correcting anemia] and general [overall health, immunity]). Vitamin C and Iron are synergistic, as are vitamin D and calcium. From a bodybuilding standpoint, the one that seems to come to mind immediately is Tribex and M.