The reason I ask is because our bodies as human beings have an amazing immune system and unless you have an autoimmune disease, naturally our bodies can heal ourselves from sickness.
I’m speaking primarily on the common cold, Influenza or anything similar like it, including even COVID.
You’re talking about surviving without X. Well, we survived without washing our hands, showering, brushing our teeth, etc. for 99% of human existence as well. Better be consistent in your beliefs and return to living as a hunter-gatherer in the woods.