I'm sure there must be another phrase but I just can't seem to find it. I'm not looking for a word to replace "unsung", I prefer a completely new phrase/idiom that expresses the same meaning.

I'm writing a post on the ingredient "glycerol" and wanted to title it "**glycerol:** **the unsung hero**" as it's a beneficial but overlooked ingredient. I would prefer another phrase instead of this one.

Thank you.