Trump has taken hydroxy ... (I can't pronounce it; forget it). Years ago, Nancy Reagan was consulting an astrologer.
As for myself, my main health advice is pretty simple. Things like exercise, good diets, plenty of rest, reduce stress and enjoy life. Those things plus a regular doctor's recommendations; like prescriptions, dental work, or whatever.
My health advise relates more to lifestyle than something to consume. Nothing in pill form. Nothing, really, for sale. Healthy living usually boosts the immune system.
Oh, yes, I do take a multiple vitamin and maybe some vitamin C, mostly because the orange flavored pills taste good. I try not to take too much. I don't know how important a vitamin pill is as long as I get my fruits and vegetables.
As for special remedies, like that hyd (whatever). It's nice to know that lots of potential treatments are in the pipeline being thought about and tested. Some things might be beneficial, others are found to be more harm than good. Combinations of these things are being looked at. It's nice to know the science is being done, but I just think of things like this in terms of future hopes. The science is not really ready.
I wouldn't try any of these things now, unless, maybe I was desperate. Unless maybe I was in the hospital and some doctor said, "let's give this a try."
Some people have gone to Mexico and other spots for treatments not yet available through the long approval process in USA.
In recent years they've loosened up a few regulations with the Right To Try Act. That, only as a last resort.
More likely, people go abroad for medical care to avoid the high cost of care in USA. Medical tourism, but that's a different story.