No, I have not heard of Nuraflex, but did some research. This is one of many Off the Shelf (meaning non prescription) products that advertise to stop arthritis and joint pain. This particular product advertises 7 "Amazing Ingredients",.. ....Hyaluronic Acid, Nanomeds Collagen II, Devil's Craw Root Extract, Bromelain, Bosweilla Serrata Extract, Glucosamine and the last "Amazing Ingredient" is Chondroitin. "Amazing" is their terminology - not mine....and yes, I'm being sarcastic. I just have no faith in food grade, off the shelf products.
Nowhere on the website do I see a U.S. Pharmacopoeia certification or a guarantee for potency, purity and dissolution. The website advertises clinical trials, but does not elaborate.
I say let the buyer beware. If you are taking Joint Pain or Arthritis prescription drugs like Celebrex, Prednisone, Lyrica, Mobic or Prednisone then I would think this Nuraflex would have less side effects, but beware the products that 1- have no guarantee or are not manufactured to Pharmaceutical Good Manufacturing Practices.