The Neil Riordan Center for Regenerative Medicine, formerly the Pain Relief Center, is located in Tempe, Arizona. Did you know that your body can be stimulated to heal itself with stem cells? We each possess millions of adult stem cells that play a key role in response to injury. Stem cells accelerate healing, reduce inflammation, and prevent scarring. But, not all treatments are the same. Choose the leader in pain relief - Neil Riordan Center for Regenerative Medicine at Southwest College of Naturopathic Medicine.