I am well aware of that. I do not respond to any of the ‘cillins. And I am allergic to neomycin.
I appear to be allergic to penicillin.
Lately I’ve used oil of oregano for things like oncoming colds and what seemed to be a gum or tooth issue. Passion Flower and Valerian for sleep, Oscillococcinum for onset of colds/flu. All work pretty well, for me.
My brother recently found the Boiron Calendula cream as good as the pharmaceutical stuff, for his dry/itchy skin.
Some of the natural stuff works, and of course it is always going to be individual. But if TPTB never put the effort into studying something, they can always say “There is no proof...” - and that goes down as if they had said “Doesn’t work”.
(Having said all of that, sound nutrition and a temperate life in all respects probably represent the best way to avoid health issues.)