Also known as: Chondroitin Sulfate, CS, Chondroitin-4-sulfate
Chondroitin sulfate is a major glycosaminoglycan found in cartilage that helps retain water, maintain elasticity, and inhibit degradative enzymes. It is widely used for osteoarthritis symptom relief and cartilage protection.
Chondroitin sulfate is a sulfated glycosaminoglycan (GAG) composed of repeating disaccharide units of N-acetylgalactosamine and glucuronic acid. It is a critical component of the extracellular matrix of articular cartilage, where it provides compressive resistance by attracting and retaining water within the tissue. Beyond its structural role, chondroitin inhibits matrix metalloproteinases (MMPs) and aggrecanases that degrade cartilage, while stimulating chondrocyte production of new proteoglycans and collagen. Clinical trials, including the STOPP study and a Cochrane review, support its use for symptomatic relief in knee osteoarthritis, with effects typically emerging after 2–3 months of daily use. Pharmaceutical-grade chondroitin sulfate sourced from bovine trachea or shark cartilage shows the best clinical outcomes.
A Cochrane meta-analysis found that pharmaceutical-grade chondroitin sulfate at 800–1.200 mg/day produces clinically meaningful reductions in pain and improvements in function for knee OA.
Chondroitin sulfate inhibits MMPs and aggrecanases while promoting proteoglycan synthesis, leading to measurable reductions in joint space narrowing over 2 years.
Once daily or split into 2–3 doses with meals
Pharmaceutical-grade chondroitin sulfate (e.g., Condrosulf, Structum) is recommended over low-quality supplements, as purity varies widely.
Evidence-based osteoarthritis support
Comprehensive joint support in a single product
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