A closed cupboard, closet, or drawer, well out of reach of young children, is best. As part of a public health drive to eliminate rickets, milk producers began adding 400 IU of Vitamin D to every quart of milk. If you sweat a lot from an athletic activity or hard work in hot weather, drink plenty of water instead of those expensive sports drinks. It's important to replace the lost fluid. Foods cooked in cast-iron absorb safe, tasteless amounts of extra iron.
Acidic foods absorb the most.
Tomato sauce simmered in a cast-iron pot could have as much as 300 times the iron as sauce simmered in an aluminum pot. Iron supplements in even small amounts can be toxic to young children. Keep iron supplements containing iron out of the reach of children. Vitamins do cost money, but so does being sick. A whole year's supply of Vitamin E costs a lot less than just one day in the hospital because you have pneumonia.