Dr. William Keller Ph.D.

Vice President of Health Science and Educational Services
Natures Sunshine Products

Board Member - American Herbal Products Association (AHPA)

Board of Trustees, and the Dean’s Advisory Council at both
Texas A&M University

and Idaho State University.

More about Dr. Keller

Possibly the most important doctor
for your personal health.

Leads the Nature's Sunshine team of 24 scientists

Why Dr. Keller's research team is important to you.

  1. The most important doctor for your personal health just might be Dr. Keller. He leads the research team of 24 scientists at Natures Sunshine that is responsible for producing an arginine product that delivers the promise of all the Nitric Oxide research. All the research in the world is worthless unless you can put reasearch into a real product that gets results.

  2. No other Arginine supplement has been more effective than ProArgi-9+. The key to this success is Dr. Keller's experience with manufacturing processes at Natures Sunshine. He and his team have produced an arginine supplement that is assimilated better than any other product in the world.


All the research in the world is worthless unless you can put it into practice.

It turns out, that making an arginine supplement
that actually works is not easy.

Since ProArgi-9+ was launched in 2008 there have been several "Me-Too" arginine products that have come along. They might have the same ingredients and maybe a few extra, but all of these "Me-Too's" have all but disappeared. The reason is they don't deliver results. They use cheap ingredients and short-cut manufacturing. It's easy to identify them.
Ask where the product is manufactured and if it's tested for purity and efficacy.

Introducing Nature's Sunshine
ProArg-9+ undergoes 262 tests for purity, contamination, efficacy and assimilation before it leaves the factory.

NSP meets or exceeds current government Good Manufacturing Practices and pharmaceutical quality standards.


When it comes to your health, you want the best.
ProArgi-9 Plus is manufactured by Natures Sunshine Products and meets or exceeds government Pharmaceutical Quality Standards. Natures Sunshine has been awarded Good Manufacturing Certification by the public health and safety organization, NSF International. Nutritional Outlook magazine named Nature's Sunshine "Manufacturer of the Year" for its outstanding quality and manufacturing excellence.

Our 250,000+ square-foot facility includes a climate-controlled warehouse and cutting-edge laboratory equipment. This allows us to manufacture consistently high-quality products for our customers all over the world.


Manufacturer of the Year 2002, Nutritional Outlook magazine named Nature’s Sunshine top manufacturer for its outstanding quality and manufacturing excellence.

ProArgi-9+ is in the
2014 Physicians Desk Reference
ProArgi-9+ will be included in the 2014 edition of the PDR. Found in virtually every physician's office, pharmacy, clinic and library, no medical reference is more current, more recognized, or more respected. The PDR contains label information, dosage instructions, images and more.

NSF International, a non-profit, non-governmental organization and world leader in standards development and product certification, presented Nature’s Sunshine with the NSF Good Manufacturing Certification.

NSF is a leading, third-party auditor of companies involved in the health and public safety sectors. Their certification of our manufacturing facility means we passed an extensive audit by NSF staff, including an examination of production equipment and a thorough evaluation of our policies and procedures and our manufacturing processes.

Our manufacturer tests every ingredient
for purity and efficacy.

Somebody else buys what they reject. Not all arginine is effective and some sources can be dangerous. Beware of cheap arginine originating from China. Our raw materials and finished products undergo more testing than other companies'.

Designing superior products begins with exhaustive research and development by the finest laboratories in America.

We travel the world to find the most wholesome raw materials and freshest ingredients. All raw materials must meet the strictest standards, and all manufacturing incorporates the latest quality assurance techniques and technology.

Quality at Every Step

The quality process starts with the raw herb harvested from the fields and extends through the manufacturing process to the finished products you use every day. Time and time again, we hear stories of people who have tried other brands, only to come back to Nature’s Sunshine because they just weren’t getting the results they had experienced with our products.

Because we manufacture our own products, we can build quality into them and control every aspect of testing along the production process.  Watch the video below of our manufacturing process to learn more.

Synergy is a wholly owned subsidiary of Nature’s Sunshine Products, a 37-year-old, debt-free giant. Synergy benefits from this relationship with NSP in many ways. Nature’s Sunshine Products manufactures many Synergy products, and NSP scientists work with Synergy to oversee the design, manufacturing and production of all Synergy products.

In 2002, NSP opened a new, state-of-the-art manufacturing plant, with mechanical systems and quality-control mechanisms comparable to those used in the pharmaceutical industry. No other natural-health company can claim this level of attention to detail and insistence on the highest levels of manufacturing excellence. The power of Synergy rests on the quality, purity and uniqueness of our products. We invite you to discover for yourself how our superior formulations can dramatically improve your life and change your appearance.


When it comes to making quality products that yield results, there is no substitute for success. With over 35 years of experience, no company in the health supplement industry works harder to provide quality vitamins, minerals and herbal formulas.

At Nature’s Sunshine we pride ourselves in our team of scientists, each chosen for their specific knowledge of product research, development and quality control. With Nature’s Sunshine you can be sure you’re getting the highest-quality, best-formulated products available.

NSP scientists work with top researchers at renowned universities to study and test our products and their active constituents.

Dr. William Keller Ph.D.
Vice president of Health Sciences and Educational Services at Nature’s Sunshine Products.
Medical and Scientific Advisory Board Synergy WorldWide

Over 100 published research papers
More than 200 scientific addresses
Manuscript referee for 10 scientific journals.
22 research grants

B.S. (Pharmacy) degree in 1966 Idaho State University.
M.S. (Pharmacognosy) degree in 1969 Idaho State University.
Ph.D. (Pharmacognosy) degree in 1972. University of Washington
From 2001, Dr. Keller has been active in research, teaching, and service at both
Department Chair/Professor in the School of Pharmacy at Stanford University (SU) 1995
Department Chair/Professor in the School of Pharmacy Northeast Louisiana University (NLU) 1989

Serves on the advisory board, American Herbal Products Association (AHPA)
Serves on the Board of Trustees, and the Dean’s Advisory Council at both Idaho State University
Serves on the Board of Trustees, and the Dean’s Advisory Council Texas A&M University – Kingsville

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