Source Naturals Glucosamine Chondroitin Complex with MSM provides four important building blocks for healthy joints and connective tissues: glucosamine, chondroitin, bioavailable sulfur (MSM), and vitamin C. Glucosamine, an amino sugar, is an essential structural component of glycosaminoglycans, large linear molecules that help to lubricate joints. Suggested Use: 3 tablets daily with meals. Allergy Warning: Contains shellfish (shrimp, crab, and lobster) and soy. Over 40 Years of Trust. Source Naturals was created in 1982 by CEO Ira Goldberg to support everyone?s potential to enjoy optimal health. Manufactured in the USA. Manufactured in Scotts Valley, CA, under the Good Manufacturing Practices (cGMPs) established by the US Food and Drug Administration. (FDA)