Any process that activates or increases the frequency, rate or extent of the chemical reactions and pathways involving a vitamin, one of a number of unrelated organic substances that occur in many foods in small amounts and that are necessary in trace amounts for the normal metabolic functioning of the body.
Synonyms:
exact_synonym:
positive regulation of vitamin metabolism; up regulation of vitamin metabolic process; upregulation of vitamin metabolic process
narrow_synonym:
activation of vitamin metabolic process; stimulation of vitamin metabolic process