Sure it is a snake oil to some of their conditions, no joke to me anyway.
I first diagnosed with TMJ years ago but no cure on it. Until I was prescribed Gloucosamine/Chondroitin to try on, it turned wonder within a day. BTW the tingling sensation on my finger joints turned disappeared, my jello feel knees have been strengthened since then.
No worry to swallow the pills for a month to see whether it is your buddy, or your are someone else.
30yrs tennis; 20yrs stringing; no stopping