Ontario company. My wife, who is in constant pain due to MS, swears by this product. The roller version allows you to briefly massage it into the skin

I’m fine with that, if it’s true. I’m not telling her. She has enough to deal with.
Placebo is a powerful misunderstood effect!
For these products they LITERALLY have to have no effect on the body to be sold over the counter. Any meaningful absorption through the skin into the body means they will be regulated and sold behind the counter, usually with prescription.
If they do more than moisturise, dry, clean, or add a scent they’re regulated.
Not true, you can buy Voltaren Gel over the counter and it contains NSAID medicine.
You’re right, but that gel is FDA regulated. It’s OTC because they did the work to bring it to the other side of the counter.
Most of the rollers are just nothing, or homeopathic.
Homeopathetic you mean 😀

