Statistically speaking, you aren't well-equipped to make sensible medical choices. That's why we have medical professions — pharmacology, virology, internal medicine, and hundreds of others — each with people working in them with years of training and understanding.
The question is less, "will X formulation work as a remedy for long covid," and more, "what effects will X formulation have on someone with Y and Z conditions, in their late 60s, having undergone this, that, and the other medical procedures on so-and-so timelines, and still on a course of this other formulation to abate chronic symptoms as a result of complications during one of the medical procedures they underwent?"
This isn't really even a contrived example. Many people undergo medical procedures. Complications aren't common, but they're not rare, either, and they vary greatly in magnitude and long-term effects. A staggering proportion of people are on a course of some kind of medication (antivirals, pain relievers, more specialized stuff) at any given time. Figuring out how medications interact is aggressively nontrivial, and while there exist databases that can correlate medications and tell you if any are known to conflict with eachother (either always or under certain circumstances — information which, in most cases, was documented through case studies), this information still has to be reviewed by a trained medical professional — an MD familiar with the patient's medical history, ideally — who can say with a good degree of confidence whether a treatment is likely or not to cause the patient harm.
The question is less, "will X formulation work as a remedy for long covid," and more, "what effects will X formulation have on someone with Y and Z conditions, in their late 60s, having undergone this, that, and the other medical procedures on so-and-so timelines, and still on a course of this other formulation to abate chronic symptoms as a result of complications during one of the medical procedures they underwent?"
This isn't really even a contrived example. Many people undergo medical procedures. Complications aren't common, but they're not rare, either, and they vary greatly in magnitude and long-term effects. A staggering proportion of people are on a course of some kind of medication (antivirals, pain relievers, more specialized stuff) at any given time. Figuring out how medications interact is aggressively nontrivial, and while there exist databases that can correlate medications and tell you if any are known to conflict with eachother (either always or under certain circumstances — information which, in most cases, was documented through case studies), this information still has to be reviewed by a trained medical professional — an MD familiar with the patient's medical history, ideally — who can say with a good degree of confidence whether a treatment is likely or not to cause the patient harm.