Glucosamine is a naturally-occuring form of "sugar", but does not resemble its sweet counterpart that we add to our coffees. Instead, glucosamine is an important substance to keep joints healthy. Glucosamine is extracted from crabs, shrimps and other shell-fish and is among two important substances present in cartilage: glycosaminoglycans and hyaluronic acid. Glucosamine is a part of joint cartilage, which means that taking it as a supplement is like “refilling” the cartilage.
So, how does glucosamine operate? Glucosamine simply nudges the cartilage cells so that they produce more of proteoglycans, which are normal and strong. Besides, while producing proteoglycans, glucosamine also inhibits some other “destructive” enzymes such as lysosomal enzymes and collagenese which break down the cartilage. Glucosamine also helps to neutralize the free radicals that may harm the cells thereby restoring cartilage.
Because of its protective qualities towards joint cartilage, glucosamine has been used for a long time, first to prevent osteoarthritis, and later as a supporting treatment. And it is not only animals that benefit from its properties, as glucosamine is also extremely useful for pets, especially older dogs and cats, or those with mobility problems. Moreover, because of its safety and its role as a nutritional supplement rather than a drug, well, the FDA classifies it as an over-the-counter product.