The secondary metabolites that make up essential oils are nature’s response to harsh conditions. When the plant endures pain, drought, flood or even bacterial or animal attack, it manufactures chemicals to make its life easier.
Less painful, if you like.
Wintergreen is comprised of mostly a chemical named salicylic acid. Deemed, in clinical trials to be thirty times more potent than aspirin, its job in the plant is to transmit information from one flower to the other about infection in the organism.
In other words, wintergreen understands when the body is being attacked and summons defences to support it
Copaiba and frankincense both act as comforters, wrapping the poorly body in a soft cosy blanket of calm.