There are herbs that stimulate the immune system. I wonder if folks who took vaccines might benefit from taking them? Most of them are harmless, although some are pretty rugged if a person has certain conditions, so do your homework first if you have something like kidney disease/failure, as many things affect kidneys znd other conditions like asthma or other immune system problems negatively.
Not the craziest idea I’ve ever heard. And whatever exercise a person a capable of. That’s also huge.