like i also think, many supplements, and much of the homeopathy stuff,
is "woo" or bunk or crapola. *Some* of it, there IS an actual basis of some kind, for the claims made, but, much of it is "woo".
I think there are tons of scamsters

out there, selling snake oil. I think humans are often suggestible, and i think many ppl with dogs they adore can be vulnerable to such scamsters, too. I also think there ARE a subset of scamsters selling stuff who
seem to truly believe that so-and-so oil will do this or that, and many of us humans see what we are told is there.
It can be like the children's story, "The Emperor's Clothes" at times.
but, i do certainly understand someone loving their dog, and i totally completely understand someone doing anything and everything they can to help their dogs. OH, do i ever.

I just have a healthy skepticism of sales ppl, and i am aware, anyone can sell anything,
and say whatever they want to about it.
Even i could market scented baby oil,
tell you it is Rosemary Extract, put a label on it which reads "Rosemary Extract".
and further tell you, that Rosemary Extract calms a dog down, or makes a dog livelier,
or whatever i think ppl are looking for.

I can pretty much say whatever i want to about my over-the-counter stuff.
This is true for products for humans, too. Who hasn't seen some "over-the-counter" products being advertised for ppl who want to lose weight, or "for men"? 
Month after month, right on tv!! MIght just be a pill made out of baking soda.
Millions are being made. Those TV ads have to cost
a fortune,
so a LOT of ppl must be falling for this stuff.
Sure, sooner or later, customers realize it is a scam, but, by then, the scammers have already made their millions.
There are no easily-enforcable laws against that, over-the-counter stuff is NOT well regulated. If a scamster does get shut down, in another month, they have a new website, or a new shelf in the store, maybe a new name for the same stuff...maybe new promises, as well.
ANYONE can run a website or a factory and sell
whatever, and tell you it is this or that, and tell you it will
DO this or that.

I could do this, but, i wouldn't, i'd see that as immoral. But if i did sell snake oil, I could even get ppl to post testimonials on my website,
about how my oil helped their dogs so so much, etc etc.
Especially if lots of ppl all swear something is real or true, we can get fooled by that, happens to me now and then, cuz i am a human, and it's easy to prove humans ARE suggestible.