Could vitamin E (and other nutrient vitamins) be considered chemicals?

My daughter asked me what vitamin E was… in the moment I couldn’t think of the right word so I answered that it was a kind of chemical… my wife got very upset that I called it that. Now I’m curious if I was completely out of line by calling it a chemical or if my wife was just over reacting

Edit* my wife doesn’t always understand that “chemicals” are everywhere and not inherently dangerous. I just needed to prove the point to myself. Sorry if I wasted your time reading this