Natural Factors FlexAble Glucosamine Sulfate - Sodium Free - Aging inhibits our ability to regenerate and restore normal joint structures. The main function of Natural Factors FlexAble Glucosamine Sulfate (GLS) is to stimulate the production of cartilage necessary for joint repair. Double-blind studies have shown GLS to relieve pain and inflammation in joints by helping the body repair the damaged joint. The repair process can take several months so pain relief comes slower than traditional alternatives, however, studies have shown GLS to be superior in relieving pain with no side effects. Sodium-free for those who suffer from hypertension, or those on sodium restricted diets, Natural Factors FlexAble Glucosamine Sulfate is isolated from shellfish chitin and is not recommended for those suffering from shellfish allergies.