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Glucosamine is popular as a supplement for warding off joint problems. But it turns out that it may also improve colon health. A Japanese animal study, published in the journal Carbohydrate Polymers, found that the ingredient, which may be derived from either shellfish or a vegetarian source, mildly reduces inflammation that drives inflammatory bowel diseases. Although it’s usually found in pills or powdered supplements, glucosamine may soon be added to sports drinks, other beverages, nutrition bars, and other foods.