The term "orthomolecular" was coined by Nobel prize laureate Linus Pauling. "Ortho" means correct and "molecular" refers to the structure of molecules, the smallest units of organic matter. Molecules are made of atoms bound together in specific ways with particular geometric structures. Just as a fine automobile is designed to work with parts which are specifically designed to fit into that machine, so the biochemistry of the body is designed to work best using the exact molecules nature has supplied. Just as bolting a Ford intake manifold into an automobile designed by Mr. Honda’s engineers is not the wisest of actions, so putting synthetic drugs into a body designed by nature is less than the most brainy of actions. Nevertheless, doctors do this every day.
Linus Pauling recognized this most fundamental error many years ago and advised against it. For this he was ridiculed. Nevertheless, he was right. Doctors who practice orthomolecular medicine are in agreement with Dr. Pauling. They recommend only medicines which are found in nature, or are manufactured in the body. These include vitamins (but not the synthetic patented analogues made by drug companies), nutrients, and hormones (but not the patented synthetic hormones made in the laboratory of man).
"Orthomolecular medicine" is almost another term for nutritional medicine. In fact, I would be hard pressed to point out the differences. Therefore, if you follow that hyperlink you will learn a lot about orthomolecular medicine. For further information, visit endocrinology.