Viartril®-S is the Crystalline Glucosamine Sulfate. It is the original and only Glucosamine Sulfate that has been fully tested in clinical trials for safety and efficacy.Clinical studies and the world-wide clinical experience have shown that Viartril®-S relieves the symptoms (pain and function limitation) of osteoarthritis. Recent, state-of-the-art clinical trials have also demonstrated that Viartril®-S is the first compound that, when given for long-term treatment courses (i.e. at least 3 years), can decrease the progression of osteoarthritis.