Their famous fundraising efforts led to the formation of the hospital and by the time it opened its doors to patients on February 11, 1753, six of the first people treated were psychiatric patients. Benjamin Rush came to the hospital and changed the psychiatric treatment in America forever.
flavor enhancer. noun. 1. a substance added to food in order to enhance or intensify its flavor: Salt is a common flavor enhancer. Contemporary definitions for flavor enhancer. noun. a chemical substance added to a processed food to improve the quality or taste. Examples.
Enhancer or Enhancement. From the word enhance: to make greater, as in value, beauty, or effectiveness; augment; to provide with improved, advanced, or sophisticated features. This would satisfy the request for a word that applies to something that adds value to something else. But I don't think I've heard it used to apply to a person who adds to the value of something. I believe that the words adjunct and adjunctive could be used to express the concept of someone or something that adds value to someone or something else.