Christopher EllisCEO Dynamic Physio Therapy

Glucosamine & Chondroitin: The Science of Joint Health #shorts

7 Sept 2026 · 1 min

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In this short video, Christopher Ellis explains the biological makeup of tendons to clarify how glucosamine and chondroitin supplements relate to joint health. He uses a rope‑in‑gel analogy: the rope‑like collagen fibers provide tensile strength, while the surrounding gel‑like ground substance supplies flexibility, hydration, and shock absorption. The ground substance is composed of 70‑80% water and a mixture of glycosaminoglycans (GAGs) such as chondroitin, proteoglycans, glycoproteins, and electrolytes (sodium, potassium, calcium). These components maintain osmotic balance and contribute to the functional properties of tendons and cartilage.

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You've probably heard of glucosamine and chondroitin as a supplement you can take for, you know, joints and cartilage and tendons. So what are tendons made of? Well, if you kind of picture a rope embedded in a gel, that's similar to the substance that a tendon is made out of. The fibrous, ropey, collagenous part is what gives it the strength, whereas that gel or that ground substance Is what gives it flexibility, hydration, and shock absorption. That ground substance is made about 70 to 80% of water, and then something called the GAGs, or glycosaminoglycans. Glycosaminoglycans. And then there's chondroitins in there, proteoglycans, glycoproteins, and then there's ions such as sodium, potassium, calcium. So in other words, electrolytes. And those are what help maintain the osmotic balance.