Source:http://linkedlifedata.com/resource/umls/id/C0597672
GO: The chemical reactions and pathways involving vitamins. Vitamin is a general term for 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. Vitamins may be water-soluble or fat-soluble and usually serve as components of coenzyme systems. [GOC:ai],CSP: synthesis and/or breakdown of vitamins by living organisms.