I believe if you want to try them, go right ahead. If they work for you, great.
Unfortunately, there is no particular reason to think that these cure-alls would work any better than, say, standing on your head and sprinkling shredded parmesan cheese on your scrotum. If you really want to know if something works, probably the best you can do is a randomized, double-blinded, placebo-controlled trial. Of course, nobody is going to do that with these remedies, so we'll probably never really know.
Which is not to say that they don't work. It's just that I have no reason to believe in them. They may sound better than the standing-on-your-head-parmesan-cheese thing, but that's really all. But when they start talking about vinegar killing the bacteria for sore throats, that just tells me they don't have a real good idea what's going on.
Of course, there are plenty of things we do in medicine that aren't backed by rigorous RDBPCTs, but unfortunately that's just the way it is, and we do the best we can. Sometimes that means trying things that don't always make the most sense.