Even slight shortfalls of iron can trigger fatigue, but most multivitamins contain an adequate 18mg of iron.
Unfortunately, popular morning beverages can sabotage a multivitamin's effect.
Tannins in coffee and tea bind to iron in the gut, hindering its absorption.
Milk's calcium competes with iron for entry into the bloodstream, blocking iron uptake: One study found that 4.5oz. of milk reduced iron absorption by up to 60 percent.
For a superior morning chaser, it is suggested to take OJ or cranberry juice.
Both contain vitamin C, which optimizes iron absorption.
But if you favor coffee, tea, milk or calcium - fortified juices, just wait an hour after drinking them to take your multivitamin.