Orthomolecular Definition

Of or involving a regimen in which megavitamins, trace minerals, etc. are taken in an effort to improve the balance of nutrients in the body molecules.
Webster's New World
Of, relating to, or being a theory holding that mental diseases or abnormalities result from various chemical imbalances or deficiencies and can be cured by restoring proper levels of chemical substances, such as vitamins and minerals, in the body.
American Heritage Medicine