vitamin B complex
- noun a group of vitamins which are soluble in water, including folic acid, pyridoxine and riboflavine
- The whole complement of B vitamins plus biotin and folic acid. They are all water-soluble and tend to be found together in natural foodstuffs. Most are prone to destruction by excessive temperatures and sunlight. Some authorities include choline, inositol and PABA in this grouping.