to the pre-germ theory days, but no. It's a fucking industry, largely exempt from oversight. Heck, in the US, the lawmaker who succeeded in getting exemptions for bullshit supplements just happened to be neck deep in investments in bullshit supplements.
boof (OP) replied with this 1 year ago, 24 minutes later, 9 hours after the original post[^][v]#1,323,943
Well what comes to mind in today's world immediately is magnetic bracelets for arthritis. Another is electrical stimulation of muscles for pain relief. Then there's anything that is supposed to draw out what is unspecifically referred to as "toxins". For historical stuff, I found this site that shows an exhibition of items to click through: https://lancastermedicalheritagemuseum.org/wp-content/themes/edward-hand/vm/vex4/index.htm
boof (OP) replied with this 1 year ago, 4 minutes later, 9 hours after the original post[^][v]#1,323,945
Back to the modern, I have heard some legit studies of red light investigations for possible efficacious therapies. It's not really developed into anything really proven yet, but that doesn't stop spas from offering it, or the mass selling of cheap underpowered red/infrared LED panels that may or may not really do anything, but make a buck for the seller.
Anonymous D joined in and replied with this 1 year ago, 4 hours later, 14 hours after the original post[^][v]#1,323,957
USB powered air purifiers that came out during covid. I could see there was a tiny blacklight in it. If that's all it took, sunlight would have cured covid on day 1.