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    Ingredient guide · Ingredient reference

    Articular cartilage contains water, collagen, proteoglycans and living cells

    The smooth joint surface is an organized hydrated tissue. Its function depends on how its components interact, not simply on the presence of collagen.

    Read the evidence ↓

    Supplement Science Insights Editorial Team

    Published September 23, 2026

    Where this cartilage sits

    Articular cartilage covers the ends of bones where they meet in joints, helping surfaces move with little friction. It is a form of hyaline cartilage. AAOS notes its limited intrinsic healing capacity; a damaged joint surface is not equivalent to a simple dietary collagen shortage. [1]

    The principal components

    The composition review describes chondrocytes within an extracellular matrix rich in water, collagen—predominantly type II—and proteoglycans. Cells maintain their local matrix, while the hydrated molecular network helps the tissue respond to loading. The source is a basic-science review; it does not test an oral supplement or show that consuming a component rebuilds a joint surface. [2]

    Avoid a percentage mismatch

    Imagine one description reports a constituent as a percentage of wet tissue and another as a percentage of dry matrix. Those figures have different denominators and cannot be compared directly. Likewise, a powder labeled type II collagen is an ingredient description, not an intact cartilage implant or evidence that it repairs a particular injury. [2]

    Hypothetical example — interpret the stated distinction, not diagnose or recommend a product
    Hypothetical descriptionWhat to keep distinct
    Wet tissue weightIncludes substantial water
    Dry matrix weightDifferent denominator
    Oral collagen ingredientNot the organized joint tissue
    Articular cartilage contains water, collagen, proteoglycans and living cells — original article outline diagram
    Original editorial diagram of this article’s sections; no product photograph or clinical finding is depicted.

    Sources for this article

    1. Articular Cartilage Restoration - OrthoInfo - AAOS
      Source consulted: 2026-09-20. This is a reference resource, not a claim that we conducted the studies or tested a product.
    2. The Basic Science of Articular Cartilage: Structure, Composition, and Function - PMC
      Source consulted: 2026-09-20. This is a reference resource, not a claim that we conducted the studies or tested a product.