A treatment that is safe but not proven by the FDA to be effective would not be part of the medical system (ie. doctors, insurance, Medicare), just an available

A treatment that is safe but not proven by the FDA to be effective would not be part of the medical system (ie. doctors, insurance, Medicare), just an available and minimally safe product. People are already "milked" on supplements and herbal remedies (which is at least still regulated to be safe, not necessarily true for a lot of informal quackery out there): people buy a lot of them without FDA approval or a medical prescription in the hopes that it somehow helps them. It's just fine. Rigorous FDA approval has & will always be available for people to use. They're grown adults, let them make that decision. If people distrust the medical system because products outside the medical system have failed them, well, people are allowed to be stupid.