Eucalyptus, Camphor, and for third - ties between Fir, Spruce, Basil, Pine, Peppermint (smaller amounts of the last 2, most of Euc.)
I didn’t know that. I always like Eucalptus. Since I suffer from allergies it might be because of the relief it gives. But I never really connected the two. Cool.
I make a blend for myself and others and posted the exact amounts on the Natural Health thread, freepmail me if you are interested and I’ll ping you to it.