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For over a decade, millions of people, in more than 60 countries around the world, have benefited from DONA™. DONA™ contains the ORIGINAL Glucosamine Sulfate that has been thoroughly studied and shown effective to promote cartilage metabolism, protect joint structure and support joint mobility. DONA™ once-a-day dosage offers the more convenient, easy to remember regimen for maintaining joint health.



Dietary Supplements for Osteoarthritis, American Academy of Family Physicians


Making Sense of Arthritis Supplements, NY Times
January 21, 2008

Glucosamine, Chondroitin Sulfate, and the Two in Combination for Painful Knee Osteoarthritis, The new england journal of medicine

February 23, 2006

Nutritional Supplements for Knee Osteoarthritis — Still No Resolution, The new england journal of medicine

February 23, 2006

Current role of glucosamine in the treatment of osteoarthritis, Advance Access publication

March 31, 2007

The Efficacy of Glucosamine Sulfate in Osteoarthritis: Financial and Nonfinancial Conflict of Interest, Arthritis & Rheumatism

July 2007


* Philadelphia, Pennsylvania, October 29 - November 2, 2000
DONA™: studies presented at American College of Reumatology 64th meeting

* November 2, 2000
Rotta's glucosamine prevents damage in OA

* November 2, 2000
Clinical study confirms previous results of Glucosamine Sulfate on joint health

* August 7, 2000
Rotta Research Laboratorium announces agreement with Forest Laboratories for license of Dexloxiglumide

* November 15, 1999
Glucosamine Sulfate Reduces Progression of Knee Osteoarthritis