Glucosamine is produced by the body as a building block for cartilage, the cushioning found around your joints. Athletes such as bodybuilders use glucosamine sulfate, the most common form of glucosamine supplementation, to treat and prevent muscle and tendon injuries, though these benefits have not been proven through clinical studies.
Uses
As a key player in the formation of cartilage, many supplement manufacturers market glucosamine sulfate as a way to repair damaged cartilage or slow the loss of cartilage due to intense physical activity or injury. Bodybuilders place high amounts of stress on their joints when lifting weights, and may turn to glucosamine sulfate as a way to prevent injuries. However, the University of Maryland Medical Center notes that studies have been inconclusive in showing that glucosamine slows cartilage loss or helps repair cartilage.
Sources
Glucosamine is not found in any dietary sources, but can be taken as a glucosamine sulfate supplement in the form of a tablet, capsule or powder. Most supplements are made from the shells of crustaceans, so if you're allergic to shellfish, take extra care to choose a brand made specifically for people with an allergy to shellfish.
Side Effects and Risks
While glucosamine sulfate supplementation is generally safe, it may cause mild upset stomach, diarrhea, bloating, indigestion and heartburn. The supplement typically contains high levels of sodium or potassium, so if you're following a restrictive diet, talk to a health care provider before starting supplementation. Glucosamine sulfate may also reduce the effectiveness of insulin treatments and nonsteroidal anti-inflammatory drugs.
Dosage
The University of Maryland Medical Center notes that glucosamine sulfate is only recommended to treat osteoarthritis, so bodybuilders seeking to prevent injury should not take the supplement. To treat osteoarthritis, take 500 mg three times daily for 30 to 90 days. Always talk to your doctor before taking any supplement.
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