In modern databases, the practice of data normalization continues to be important in improving data integrity, minimizing redundancies, and eliminating anomalies. However, since its inception and consequent improvements, there have been no attempts to document a method which constrains the values of attributes capable of only possessing a limited quantity of values. These non-limited distinct attributes pose a problem throughout many relational databases as they have the potential to cause data anomalies and query inaccuracies. Thus, a new database normalization method, Limited Distinct Normal Form (LDNF), is necessary in order to improve upon the currently established data normalization process. In brief, LDNF is a method which turns non-limited distinct attributes into limited distinct attributes by forcing the attributes to conform to a limited quantity of values. Utilizing LDNF in tandem with existing normal forms fulfills a need in normalization that is otherwise not present when only using current methods. A formal approach to LDNF is therefore proposed.