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Vitamins and Coenzymes

Vitamins are generally classed as either water-soluble or fat-soluble. The water-soluble vitamins generally act as precursors to coenzymes.

https://www.rose-hulman.edu/~brandt/Chem330/Vitamin.pdf

Coenzyme: A substance that enhances the action of an enzyme. (An enzyme is a protein that functions as a catalyst to mediate and speed a chemical reaction).

Coenzymes are small molecules. They cannot by themselves catalyze a reaction but they can help enzymes to do so. In technical terms, coenzymes are organic nonprotein molecules that bind with the protein molecule (apoenzyme) to form the active enzyme (holoenzyme).

A number of the water-soluble vitamins such as vitamins B1, B2 and B6 serve as coenzymes.

https://www.medicinenet.com/script/main/art.asp?articlekey=13153