Most of been thoroughly studied and found to be ineffective at best, and harmful at worst. Those that were found effective, are introduced into mainstream medicine (meaning regular companies find safe and cheap ways to produce them, patent the process, and charge accordingly).
If you don’t want invasive procedures, just say so. If you have a private physician (as opposed to some place such as the army or a prison), they need your permission. They might say, “you know you might die if I don’t check for cancer or the like”, and you reply that you have great faith in Ha-Shem, and great feat of getting things stuck into you.