I used to sell ECOFLOW and BIOFLOW stuff. I wear a braclet all the time and my dog has bad arthritis in her fetlock, she couldn't walk without her collar. There are far too many testimonials from pet owners where there can be no placebo effect, of the vast difference it makes.
I loaned my boots out to someone - and lo and behold they have never come back!
So do they work, I can categorically say that the BIOFLO ones do, and if the don't work for your animal you get your money back. Also they have a trade in system, so that when they are worn you can PX them back in for a new set.
I no longer sell them, so I have no incentive to sing them out for financial gain.