Physician Reference

Synergy Worldwide’s Medical and Scientific Advisory Board is comprised of scientists and medical professionals who have taken a lead in the study and clinical application of heart healthy nutritional supplements. With over a century of combined experience, these individuals bring substantial knowledge, experience, and expertise to Synergy’s ongoing commitment to scientific research and development of its heart healthy products.

Synergy Worldwide Medical Advisory Board

Dr. J. Joseph Prendergast

Dr. J. Joseph Prendergast is board-certified in endocrinology, internal medicine, and metabolism. He is the author of over 50 medical articles in well-known publications such as the Journal of the American Medical Association, The New England Journal of Medicine, and Diabetes Care. Dr. Prendergast has been recommending l-arginine to his patients since 1991 and has seen incredible results, both personally and with his patients. In 2007, Dr. Prendergast partnered with Synergy WorldWide and greatly contributed to the current formulation of ProArgi-9+. []


Dr. Rainer Boger

Dr. Rainer Böger received his medical training at Hannover Medical School in Hannover, Germany. He received his postgraduate training in Internal Medicine and Pharmacology both in Hannover and at Stanford University School of Medicine in Stanford, CA. He is currently the Professor of Clinical Pharmacology and Director of the Institute of Clinical Pharmacology and Toxicology at Hamburg University Medical Center, Germany. He is also Director of the Clinical Trial Center North at Hamburg University.[]


Dr. Siva Arunasalam

Dr. Siva Arunasalam is board-certified in internal medicine, cardiology, and interventional cardiology. He completed his internship at the Harbor UCLA Medical Center in Torrance, CA and his fellowship in cardiology at Cedars-Sinai Medical Center in Los Angeles, CA. In 1996, Dr. Siva founded the High Desert Heart Institute in Victorville, CA where he currently serves as the President and attending cardiologist. He and his surrounding staff of fellow cardiologists, nurses, and medical personnel are heavily involved in researching alternative, noninvasive solutions for improving heart health. []


William J. Keller, Ph.D.

Dr. William J. Keller joined Nature’s Sunshine Products (Synergy’s parent company) in 2001 as the Vice President of Health Science and Educational Services. Prior to Nature’s Sunshine, Dr. Keller earned a bachelor’s degree in Pharmacy and a master’s degree in Pharmaceutial Sciences from Idaho State University. In 1972, he was awarded a Ph.D. in Pharmacognosy from the University of Washington. []


Dan Austin, RN

Dan Austin, RN, has been a practicing nurse for over two decades, working primarily in the areas of critical care and emergency nursing. Currently he is the clinical coordinator for the congestive heart failure (CHF) outpatient clinic at the High Desert heart Institute in Victorville, CA. As the clinical coordinator, Dan works closely with Dr. Siva Arunasalam, M.D. in the planning and implementation of clinical research studies with l-arginine and critical care for their patients.



Other Medical Experts

Dr. Louis J. IgnarroNobel Prize Laureate

Dr. Louis J. Ignarro – Nobel Prize Laureate

Dr. Louis J. Ignarro is a Distinguished Professor of Pharmacology at the UCLA School of medicine. He was awarded the Nobel Prize in medicine in 1998 for his discovery of the importance of nitric oxide to the cardiovascular system. He earned his B.S. in pharmacy from Columbia University and a PhD, in pharmacology from the []


Dr. John P. Cooke

Dr. John P. Cooke – Cardiovascular Expert

Dr. John P. Cooke is Associate Professor of Medicine and Director of the Section of Vascular Medicine at Stanford Medical School. He earned his Ph.D. at the Mayo Clinic, and served on the faculty of Harvard Medical School.
His book, “The Cardiovascular Cure: How to Strengthen Your Self Defense Against Heart Attack and Stroke” has received rave reviews by numerous scientists and medical experts. Dr. Jay N. Cohn M.D., University of Minnesota Medical School wrote, “This authoritative book appropriately points out why everyone should worry about []


Dr. Kenneth Kroll

Dr. Kenneth Kroll – Anti-Aging Expert

  • Graduate of Rutgers University
  • Graduate of Harvard Medical School
  • Training: Stanford University Medical Center

Dr. Kenneth Kroll has a very distinguished academic and medical practice resume. He was a practicing urological surgeon for many years in Northern California. Dr. Kroll then became a certified anti-aging physician. He has consulted throughout the world on immune support, anti-aging and the []

{ 1 comment… read it below or add one }

Barbara Rycraw April 13, 2011 at 12:31 pm

I want to present this product to my doctor who is a internist. I desperately want to get off of the high blood pressure medication since it only suppresses my blood pressure. As long as I continue to take this medication I will never ever be cured and some more serious health issues are going to develop. I have read lots of information on L-Arginine and other Arginine and Nitric Oxide products. Is this a product that one can look to as far as getting off the high blood pressure meds at some point? Sooner rather than later I hope. I still would like to try it whether he approves it or not. What are my risk if I decide to take this products for lowering my blood pressure on my own?


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