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How did the discovery of riboflavin explain the role of some vitamins in preventing disease?

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Diagram showing how epinephrine binding to a beta-adrenergic receptor on a cell membrane activates a G-protein, which then stimulates adenylyl cyclase to convert ATP into cyclic AMP (cAMP), leading to physiological effects such as increased heart rate, blood vessel dilation, and glycogen breakdown. — Biochemistry In biochemistry, researchers study the chemical substances and processes that occur in living organisms and cells. In particular, various processes by which cells gain energy, such as epinephrine-stimulated cAMP synthesis, have been deduced through the study of biochemistry.

The discovery of riboflavin (vitamin B2) was pivotal in understanding how specific nutrients function as essential components of metabolic systems. Initially identified as a component of the water-soluble "vitamin B" complex, riboflavin was recognized as distinct from the factor that prevents polyneuritis (thiamin).1

The discovery explained the role of vitamins in preventing disease by revealing that riboflavin functions not in its free form, but as a precursor to complex coenzymes, such as flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD). These coenzymes are critical for the oxidation of carbohydrates and amino acids, which are fundamental to cellular metabolism.23

When dietary intake is inadequate, this metabolic disruption leads to ariboflavinosis, a deficiency disease characterized by symptoms such as cheilosis (cracks at the corners of the mouth), glossitis (inflammation of the tongue), and ocular disturbances. By identifying riboflavin as a necessary structural component for these enzymatic processes, scientists established that many vitamins prevent disease by enabling the chemical reactions required for normal physiological function.2453