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The information in this web page is not intended to be taken as medical advice. Do not alter or discontinue medical treatment or use of medications without the advice of your physician. Your results with ProArgi-9+ may vary from the video’s presented, however, ProArgi-9+ is backed by an unconditional 90 day money-back guarantee. The statements on this website have not been evaluated by the Food and Drug Administration.

This is a 50 minute interview covering just about everything about Dr. Prendergast and how he came to help formulate ProArgi-9 Plus, what makes it work and what it's good for. Video: 50:03

"Over 19 years experience in clinical arginine therapy"

"More than 3 years experience with ProArgi-9 Plus in clinical arginine therapy.

Why Dr. Prendergast's clinical experience is important.

  1. ProArgi-9 Plus has been tested in actual clinical use in Dr. Prendergast's clinic since he helped formulate it. No other arginine nutritional product can say this.

  2. Dr. Prendergast has more experience with clinical arginine therapy than anyone else.

Since 1991 Dr. Prendergast has been using L-arginine therapy in the Endocrine Metabolic Medical Center with remarkable results. This is eight years before the Nobel Prize was awarded to Louis Ignarro, Robert F. Furchgott and Ferid Murad for discovering that L-arginine produces the signaling molecule, Nitric Oxide.

Dr. Prendergast brought his years of L-arginine research experience and clinical L-arginine therapy with thousands of patients in the Endocrine Metabolic Medical Center to the scientists at Natures Sunshine Products and together they formulated ProArgi-9 plus.

Since that time Dr. Joe has used the Synergy Worldwide product ProArgi-9 Plus in his practice with phenomenal results.

Dr. Prendergast has been an Endocrinologist and researcher
for over 35 years.
He is Board Certified in Internal Medicine as well as Endocrinology and Metabolism and served his residency at the University of California, San Francisco. Dr. Prendergast is a member of over a dozen national medical associations and has published over 50 medical articles in well-known publications including JAMA "Journal of the American Medical Association", "The New England Journal of Medicine" and "Diabetes Care".

During that time, Dr. Joe has empowered countless patients in the art of self-care.

"L-arginine benefits the body in a myriad of ways. We have now learned more about how l-arginine uses the two natural pathways into the brain to promote anti-aging properties, sports performance, and boost the immune system. Because l-arginine promotes healthy blood flow, it can also benefit human sexuality."
Dr. Prendergast

It has been widely reported that Dr. Prendergast has not sent one patient to the hospital for a heart attack, stent, bypass or stroke in the last 19 years.

Dr. Prendergast has had phenomenal success with his patients. He would be the first to tell you he uses everything at his disposal to care for his patients. To suggest that L-arginine or ProArgi-9 plus is solely responsible for his success with patients would be inaccurate.

He is Board Certified in Internal Medicine as well as Endocrinology and Metabolism. A graduate of Wayne State University in Detroit, Michigan, he completed his residency at the University of California, San Francisco. Dr. Prendergast has published nearly 40 medical articles in well-known publications such as the Journal of the American Medical Association and The New England Journal of Medicine and Diabetes Care. In 1986, Dr. Prendergast formed a single specialty endocrinology practice, Endocrine Metabolic Medical Center and a non-profit research foundation, The Pacific Medical Research Foundation. In 1999, he founded DiabetesWell, an eClinic that managed patients with diabetes and helped them lead healthier, longer lives.

Dr. Joe's first book, The Uncommon Doctor: Dr. Joe’s Rx for Managing your Health, reveals the secrets of preventive medicine and helps readers design a strategic wellness program. Dr. Joe hosts his own live Internet health program each week.

View Dr. Joe's Curriculum Vitae

  • Dr. Prendergast serves on the California Legislative Task Force on Diabetes and Obesity.

  • Medical Director of the Diabetic Treatment Center at Sequoia Hospital in Redwood City, CA

  • California State Chairman of the American Association of Clinical Endocrinologists

  • Reviewer of the American Board of Internal Medicine.

  •  Endocrine-Metabolic Case Reviewer, Medical Board of California Div of Medical Quality

  • He is the Founder and Medical Director of Endocrine Therapeutics, Inc.

Dr Prendergast is a member of:

  • American Association of Clinical Endocrinologists
  • Fellow, American College of Endocrinology
  •  American College of Medical Quality
  •  The California Academy of Medicine
  •  The Endocrine Society
  •  Diplomate, American Board of Endocrinology and Metabolism
  •  American Diabetes Association
  •  Diplomate, American Board of Internal Medicine
  •  Fellow of American College of Physicians
  •  California Medical Association
  •  San Mateo County Medical Society
  •  Charter Member, American Association of Clinical Endocrinologists
  •  American Society of Internal Medicine
  •  Society for Clinical Densitometry
  •  American Association of Diabetes Educators
  • North American Vascular Biology Organization