A Broth & Co guide to collagen, elastin, hyaluronic acid, fibroblasts, connective tissue, movement and healthy skin.

When people think about healthy skin, they often think about collagen. When they think about healthy joints, they may think about cartilage. When they think about flexibility, they may think about stretching.

Few people realise that all of these structures depend on the same remarkable biological system: the extracellular matrix, or ECM. It is the hidden framework that surrounds cells, gives tissues their shape and helps skin, tendons, ligaments, cartilage, blood vessels and organs stay organised.

The extracellular matrix is not a decorative layer around the body. It is living architecture. It is built, repaired, remodelled and constantly sensed by cells. Once you understand the ECM, collagen stops looking like a single beauty ingredient and starts looking like one part of a much larger tissue-building system.

 

What Is the Extracellular Matrix?

The word extracellular means outside the cells. The extracellular matrix is the complex network of proteins, specialised carbohydrates and water that fills the space around cells in many tissues throughout the body.

That sounds simple, but the idea is profound. Cells do not float around on their own. They live inside an organised environment that gives them shape, support and context. The ECM helps tissues behave like tissues rather than loose collections of separate cells.

In skin, the matrix helps create firmness, resilience and hydration beneath the surface. In tendons and ligaments, it helps transmit force. In cartilage, it helps resist compression. In blood vessels, it contributes to flexibility and structure. In bone, it provides an organic framework that works with minerals.

This is why the ECM connects so naturally with Skin Is a Living Organ: Why Skin Cells Need Both Building Blocks and Biological Signals and Matrix Biology Explained: How the Extracellular Matrix Shapes Health.

The ECM Is More Than a Scaffold

For many years, the extracellular matrix was described like scaffolding: useful, supportive and mostly passive. Modern biology gives us a richer picture. The ECM certainly provides physical support, but it also influences how cells behave, communicate, move, repair and respond to mechanical forces.

A helpful analogy is a city. Roads, bridges, building frames, pipes, wiring and public spaces do not just hold the city together. They shape how people move, how supplies travel, how communication happens and how repair crews know where to go. The ECM works in a similar way. It is the physical and biological environment that allows cells to operate as part of a coordinated tissue.

This is why the word scaffold can be useful, but incomplete. A scaffold sounds temporary and lifeless. The extracellular matrix is neither. It is built by cells, sensed by cells and continually modified by cells. It carries physical information as well as structural support. A stiffer matrix, a more hydrated matrix or a matrix under mechanical tension can all change what surrounding cells experience.

That makes the ECM one of the best examples of Broth & Co’s wider biology message: structure and communication are not separate. The shape of a tissue influences how it functions, and the way cells function influences the shape of the tissue.

 

What Is the Extracellular Matrix Made Of?

The ECM is not built from one molecule. It is made from a highly organised collection of structural proteins, water-binding carbohydrates, adhesive proteins and fluid. Each component contributes something different.

 

Collagen Gives Tissues Strength

Collagen is the body’s most abundant structural protein. It forms fibres that help tissues resist pulling and stretching forces. Type I collagen is abundant in skin, tendons, ligaments and bone. Type II collagen is central to cartilage. Type III collagen often appears alongside Type I in skin, blood vessels and soft tissues. Type IV collagen contributes to basement membranes that support and separate layers of tissue.

For more on collagen as part of the body’s structure, see Collagen Is More Than Skin: Understanding the Body's Most Abundant Protein and Collagen Amino Acids Explained: Glycine, Proline & Hydroxyproline.

Elastin Gives Tissues Recoil

If collagen provides strength, elastin provides stretch and recoil. It helps tissues return towards their original shape after being stretched. Skin, arteries, lungs and certain ligaments all rely on this property. Healthy movement depends on the balance between collagen’s strength and elastin’s flexibility.

A fuller explanation is available in Elastin Explained: The Protein That Helps Skin Stay Flexible & Resilient.

Hyaluronic Acid and GAGs Help Organise Water

Hyaluronic acid is a glycosaminoglycan, often shortened to GAG. Unlike collagen and elastin, it is not a fibrous protein. It is a water-binding molecule that helps create a hydrated environment within the matrix. That hydration matters for cushioning, lubrication, diffusion and tissue resilience.

This connects with Hyaluronic Acid Explained: More Than Hydration and Glycosaminoglycans (GAGs) Explained: The Water-Holding Molecules of Healthy Connective Tissue.

Proteoglycans Create Cushioning

Proteoglycans are large molecules made from proteins attached to long GAG chains. They help tissues retain water and resist compression, which is especially important in cartilage and other load-bearing connective tissues.

For the specific role of these molecules, see Proteoglycans Explained: The Molecules That Help Keep Skin and Connective Tissues Hydrated.

The Cells That Build the Matrix

The extracellular matrix does not build itself. Living cells produce, organise, monitor and remodel it. In connective tissue, fibroblasts are among the most important of these cells.

Fibroblasts can produce collagen, elastin, hyaluronic acid, proteoglycans and specialised matrix proteins. They are often described as the cells that build collagen, but their job is broader than that. They help maintain the tissue environment itself.

That is why Fibroblasts Explained: The Cells That Build Your Skin's Collagen, Elastin & Extracellular Matrix is such an important companion article.

Here is the “I never knew that” moment: the matrix also talks back. Cells use receptors on their surface to sense the matrix around them. They can detect stiffness, tension, organisation and biochemical cues. The cell influences the matrix, and the matrix influences the cell.

This two-way relationship helps explain why the ECM is so important in normal growth, tissue repair, movement adaptation and healthy ageing. Cells are not simply following a genetic script in isolation. They are reading the environment around them and responding to it.

This two-way conversation sits beside broader cell-communication topics such as Cellular Crosstalk Explained: How Cells Communicate to Build and Maintain Healthy Tissues and Cellular Communication Explained: How Trillions of Cells Work Together Every Second.

Why the Matrix Is Always Being Remade

One of the biggest misconceptions about connective tissue is that it is permanent. In reality, the ECM is continually remodelled. Older components are broken down, new components are synthesised and tissues adjust to the demands placed upon them.

This process is not a flaw. It is how healthy tissues remain adaptable. Skin renews. Tendons respond to load. Cartilage maintains its specialised environment. Blood vessels adapt to pressure and flow. Connective tissue is not a finished structure; it is a living maintenance project.

Controlled remodelling supports growth, normal repair, adaptation to movement and tissue organisation. Poorly regulated remodelling can change tissue quality, but the basic idea is positive: tissues remain resilient because they can rebuild.

 

Movement Shapes the Matrix

The extracellular matrix responds to mechanical force. Walking, lifting, stretching, running, balance work and everyday movement all place changing loads through skin, fascia, tendons, ligaments, cartilage, muscles and bone.

Cells can convert mechanical forces into biological responses through a process called mechanotransduction. This is one reason movement is not just exercise. To connective tissue, movement is information. It tells tissues what kind of strength, flexibility and organisation the body needs.

For more on this concept, see Mechanotransduction Explained: How Movement Tells Your Body to Build Muscle, Bone and Connective Tissue and Growth Factors Explained: The Biological Messengers That Tell Cells When to Repair.

This matters at every age. Children are growing and developing new tissue. Active adults are adapting to training, work and everyday movement. New mums are recovering while caring for a baby. Older adults benefit from maintaining strength, mobility and tissue resilience. The ECM is relevant across the whole lifespan, not only in conversations about ageing.

The ECM and Skin Health

In skin, the extracellular matrix sits mainly within the dermis, beneath the outer epidermal barrier. It contributes to firmness, elasticity, hydration and resilience. Collagen fibres provide strength. Elastin fibres support recoil. Hyaluronic acid, proteoglycans and GAGs help organise water. Fibroblasts maintain and remodel this environment.

Healthy skin therefore depends on more than collagen alone. It depends on the barrier at the surface, the water-holding systems in the outer layers, the skin microbiome, the dermal matrix beneath the surface and the cells that keep each system working.

For this broader skin picture, see Why Skin Is More Than Collagen: Understanding the Complete Biology of Healthy Skin, Healthy Skin Is About More Than Collagen, Skin Hydration Biology Explained: Why Healthy Skin Needs More Than Water, Natural Moisturising Factor (NMF) Explained: The Skin's Own Water-Holding System, Ceramides Explained: Why These Natural Skin Lipids Are Essential for Healthy Skin and The Skin Barrier Explained: Why Healthy Skin Starts With a Strong Barrier.

The ECM and Joints

The extracellular matrix is also central to joint tissues. Cartilage, ligaments, tendons, bone and synovial structures all depend on specialised matrix organisation. Cartilage, for example, needs a matrix that can hold water and resist compression. Tendons need a matrix that transmits force. Ligaments need a matrix that stabilises joints while allowing movement.

This is why the ECM links naturally with Cartilage Explained: The Tissue That Keeps Your Joints Moving Smoothly, Joints Explained: How Your Body Creates Smooth Movement and Why Joints Become Stiff: The Science Behind Mobility, Ageing & Connective Tissue.

Nutrition Supports Matrix Biology

The extracellular matrix is built by living cells, and living cells require nutrients. This does not mean nutrients become the matrix directly. It means nutrition helps support the normal biological processes that build, maintain and remodel connective tissue.

 

For nutrition background, see Amino Acids The Building Blocks, Hydroxyproline Explained: The Unique Amino Acid That Makes Collagen Different, Protein Throughout Life: Why Your Protein Needs Change With Age and The Food Matrix Explained: Why Whole Foods Matter.

Where Collagen Peptides Fit

Collagen peptides can be a practical way to provide collagen-associated amino acids within an overall diet. They do not replace varied protein foods, vegetables, fruit, healthy fats, fibre-rich carbohydrates, fluids, movement or sleep. They fit best as one part of a broader routine that supports the biology of healthy connective tissue.

For a product-specific explanation, see BC Beauty Healthy Glow: The Science of Beauty, Recovery, Mobility & Healthy Ageingor view Healthy Glow. For a wider comparison, Functional Proteins Explained: Why Whey, Collagen & Bone Broth All Have Different Roles explains why different protein formats have different roles.

For everyday food ideas, browse the Broth & Co collection of nourishing recipes.

Healthy Ageing and the Matrix

The extracellular matrix changes throughout life. Collagen organisation, elastin fibres, hyaluronic acid distribution, matrix hydration, fibroblast activity and remodelling patterns can all shift over time. These changes are part of normal biology.

Healthy ageing is not about preventing every change. It is about supporting the body’s ongoing ability to maintain and adapt its tissues. That includes enough protein, colourful plant foods, micronutrients, hydration, regular movement, sleep, stress management and practical daily routines.

The more we learn about connective tissue, the clearer one idea becomes: resilience is built through renewal. The body does not maintain healthy tissues by leaving them untouched. It maintains them by continually sensing, repairing, replacing and adapting.

Why the ECM Matters Beyond Beauty

Because the ECM sits beneath the visible surface, it is easy to discuss it only in relation to skin appearance. But matrix biology is relevant for the whole body. Children need matrix formation for growth and development. Athletes rely on connective tissue adaptation for training and recovery. Adults rely on the ECM for everyday movement, posture, circulation and tissue repair. Older adults rely on matrix renewal to support mobility, balance and independence.

That does not mean the same routine suits every life stage. Needs change with age, activity, pregnancy, recovery, appetite, health status and daily demands. The principle stays the same: living tissues need building blocks, signals and time to adapt.

A Simple Daily Matrix-Supportive Routine

This is not a strict plan. It is a practical way to think about the ordinary habits that support the living cells responsible for tissue maintenance.

 

Frequently Asked Questions

What is the extracellular matrix?

The extracellular matrix is the network of proteins, specialised carbohydrates and water that surrounds cells and helps organise healthy tissues.

Is the extracellular matrix the same as collagen?

No. Collagen is one important part of the extracellular matrix, but the ECM also contains elastin, hyaluronic acid, proteoglycans, glycosaminoglycans, specialised matrix proteins and water.

Where is the extracellular matrix found?

It is found throughout the body, including in the skin, tendons, ligaments, cartilage, bones, muscles, blood vessels and many internal organs.

What do fibroblasts do?

Fibroblasts are connective tissue cells that help produce, organise and remodel many ECM components, including collagen, elastin and other matrix molecules.

Why is hyaluronic acid part of the ECM?

Hyaluronic acid helps create a water-rich environment within tissues. It contributes to hydration, cushioning, lubrication and matrix organisation.

How does movement affect the ECM?

Movement creates mechanical forces that cells can sense. Through mechanotransduction, those forces can influence how connective tissues adapt to everyday demands.

How does nutrition support the extracellular matrix?

Nutrition supports the cells that build and maintain the matrix. Protein, vitamin C, copper, manganese, zinc, fluids and a varied diet all contribute to normal tissue biology.

Do collagen peptides rebuild the ECM by themselves?

No single ingredient rebuilds the extracellular matrix by itself. Collagen peptides can provide collagen-associated amino acids, but matrix health also depends on cells, movement, hydration, micronutrients, sleep and the wider diet.

Summary

The extracellular matrix is the hidden living framework that helps hold tissues together. It surrounds cells, gives tissues structure and creates the environment in which cells communicate, move, repair and adapt.

Collagen matters, but it is only one part of the story. Elastin provides stretch and recoil. Hyaluronic acid, proteoglycans and GAGs help organise water and cushioning. Fibroblasts build and remodel the matrix. Movement provides mechanical information. Nutrition supplies the building blocks and cofactors that living cells use to do their work.

Healthy tissue is not built by one molecule acting alone. It is built through living architecture: cells, matrix, water, movement, nutrients and time working together.