Beyond Beauty: The Protein Behind Healing, Movement and Resilience
Collagen is usually associated with skin. Smoother texture, greater elasticity and fewer visible signs of ageing tend to dominate the conversation.
But collagen does much more beneath the surface.
It is the most abundant protein in the human body, making up around 30% of our total protein. It provides structure to our skin, bones, cartilage, tendons and ligaments—and plays an important role in how these tissues repair and renew themselves.
When we are injured or undergo surgery, the body produces new collagen to help rebuild damaged tissue. When we move and exercise, collagen-rich cartilage, tendons and ligaments help our bodies absorb force, transfer movement and remain stable. Even our bones depend on a collagen framework for strength and resilience.
These functions become increasingly important as we age. Because healthy ageing isn't only about how we look. It is also about how well we heal, move, recover and remain physically capable.
So what role does collagen supplementation play—and can providing more of its building blocks help support these processes?
To answer that, we need to look beyond the skin and understand what collagen is doing throughout the body.
What Is Collagen—and Why Does the Body Need It?
Collagen is the body's main structural protein. Rather than performing one specific job, it forms a framework that gives different tissues strength, flexibility and support.
There are at least 28 known types of collagen, but three are particularly relevant to everyday health.
- Type I is the most abundant. It is found in skin, bones, tendons and ligaments, where strength and resistance to pulling forces are important.
- Type II is concentrated in cartilage, helping create the smooth, resilient tissue that cushions our joints.
- Type III often works alongside Type I and is found in skin, muscles, blood vessels and internal organs.
Together, these collagen fibres form part of the extracellular matrix—the supportive structure surrounding our cells and holding tissues together.
Collagen Is Constantly Being Rebuilt
Collagen isn't a permanent structure. The body continually breaks down old collagen and produces new collagen, although the speed of this turnover varies considerably between tissues.
This process becomes particularly important when tissue is damaged.
Following an injury or surgery, collagen helps form the new extracellular matrix needed to rebuild damaged tissue. As healing progresses, newly formed collagen fibres are reorganised and remodelled, gradually giving the repaired tissue greater strength and structure.
The same process of collagen synthesis and remodelling is also happening—at different rates—in our tendons, cartilage, bones and other connective tissues throughout life.
What Changes as We Age?
Our relationship with collagen changes as we get older.
Collagen formation and breakdown become altered with age, and existing collagen can undergo structural changes that affect the properties of our tissues. These changes vary by collagen type, tissue and sex rather than following one simple age-related decline.
Lifestyle matters too. Factors such as UV exposure and smoking can accelerate collagen damage, while nutrition and physical activity influence the environment in which connective tissues are maintained and remodelled.
The effects aren't limited to wrinkles. Age-related changes to collagen-rich tissues can influence how our joints, tendons, bones and skin perform and recover.
So What Happens When We Take Collagen?
Most collagen supplements contain hydrolysed collagen, or collagen peptides. Hydrolysis breaks the large collagen protein into smaller peptides that are easier to digest and absorb.
Once consumed, collagen may support the body's own collagen production in two ways.
First, it provides the building blocks. Collagen is particularly rich in glycine, proline and hydroxyproline—amino acids the body uses to make new collagen.
Second, some small collagen-derived peptides can enter the bloodstream intact. Researchers believe these peptides may also act as biological signals, encouraging cells involved in connective tissue to produce more collagen.
In other words, collagen supplementation doesn't simply replace old collagen with new collagen. It provides the raw materials—and potentially some of the signals—the body can use to support its own collagen production.
Collagen Beyond Skin: Recovery, Movement and Resilience
Collagen is constantly at work beneath the surface—helping tissues repair after injury, supporting our joints through everyday movement and giving connective tissues the strength to withstand physical stress.
These roles make collagen much more than a beauty protein. It is an important part of how the body heals, moves and remains physically resilient.
Healing & Recovery
When tissue is damaged through injury or surgery, the body needs to rebuild the structural framework that has been disrupted.
Collagen is central to this process. During healing, specialised cells called fibroblasts produce new collagen, creating a framework for repairing damaged tissue. Over time, those collagen fibres are reorganised and strengthened as the tissue remodels.
This process doesn't happen overnight. Collagen formation and remodelling continue long after a wound appears to have healed on the surface.
Nutrition matters during this period because the body needs adequate protein, amino acids and micronutrients to build new tissue. Collagen peptides provide particularly high concentrations of glycine, proline and hydroxyproline—the amino acids commonly found in collagen itself.
For a deeper look at how nutrition supports healing after surgery, we explore this further in A Surgeon's Perspective: What Your Body Needs to Heal, Recover and Build Resilience.
Protecting Joint Health & Mobility
Everyday movement puts our joints to work. Cartilage cushions the bones where they meet, while collagen helps give that cartilage its strength and resilience.
As we age, cartilage can gradually change and become less resilient. In conditions such as osteoarthritis, its breakdown can contribute to joint pain and stiffness. This is one of the areas where collagen supplementation has attracted the most clinical research.
Studies suggest that oral collagen supplementation may help reduce joint pain and stiffness and improve physical function, particularly in people with osteoarthritis. Research has also explored its use in physically active adults experiencing activity-related joint discomfort.
For active and ageing adults, supporting joint comfort and mobility can make an important difference to staying physically active.
Supporting Tendons & Ligaments Through Recovery
Muscles tend to get most of the attention when we exercise or recover from injury. But movement depends just as much on the connective tissues supporting them.
Tendons connect muscle to bone, while ligaments connect bones and help stabilise our joints. Both are dense, collagen-rich tissues designed to withstand considerable physical force.
When injured, they can also be frustratingly slow to recover. Their relatively limited blood supply and slow rate of tissue remodelling mean that sprains, strains and overuse injuries can take considerable time to heal.
Collagen is central to this repair process. As damaged connective tissue heals, new collagen is produced and gradually reorganised to restore strength and function.
This has led researchers to investigate whether collagen supplementation can provide additional nutritional support during rehabilitation. Studies combining collagen peptides with resistance or loading exercise suggest that supplementation may support tendon structure, strength and adaptation.
Exercise stimulates connective tissues to adapt and strengthen, while collagen peptides provide the building blocks the body uses to produce new collagen. Together, they can support the ongoing repair and resilience of tendons and ligaments.
Supporting Recovery From Exercise
Exercise doesn't challenge our muscles alone. Tendons, ligaments and other connective tissues are also placed under load and need to adapt and recover.
Collagen is particularly rich in glycine, proline and hydroxyproline—the amino acids the body uses to build collagen in these tissues. This has led to growing interest in collagen supplementation as part of exercise recovery, particularly when combined with training.
Vitamin C also plays an important role because it is essential for collagen synthesis. Some research has explored taking collagen or gelatin with vitamin C before exercise, with evidence that the combination can increase markers of collagen synthesis in response to physical loading.
For active adults, collagen's role in recovery may therefore be less about building bigger muscles and more about supporting the connective tissues that keep those muscles moving.
Bones Need Collagen Too
When we think about strong bones, calcium usually comes to mind. But collagen is also an essential part of bone structure.
Collagen forms a flexible framework within the bone, which is then strengthened by minerals such as calcium and phosphate. Together, they give bones the combination of strength and resilience needed to withstand everyday forces.
As we age, changes in this collagen framework can affect bone quality. This has led researchers to investigate whether collagen supplementation can help support bone health, with some human studies reporting encouraging effects on bone formation and bone mineral density.
So supporting bone health isn't only about minerals. Maintaining the collagen framework they are built around matters too.
What About Gut Health?
Collagen is increasingly promoted for “gut repair” and supporting the intestinal barrier. Part of this interest comes from its high glycine content, an amino acid involved in tissue repair and studied for its role in intestinal health.
The theory is plausible: collagen provides amino acids that may support the tissues forming the gut barrier. But the human clinical evidence has not yet caught up with the claims.
At present, there isn't enough high-quality research to conclude that taking collagen peptides can repair intestinal permeability or treat gastrointestinal conditions.
Gut health remains an interesting area for collagen research, but for now, the evidence is much stronger for its role in connective tissues such as joints, tendons and bones.
Collagen is far more than a beauty ingredient or another protein powder. Collagen supplementation provides targeted building blocks for the tissues that allow us to heal, move, recover and remain physically resilient throughout life.
How to Support Collagen Production
Our bodies make collagen naturally, but the process depends on having the right raw materials and nutrients available. Diet, lifestyle and supplementation can all play a role.
Start With the Building Blocks
Collagen is a protein, so producing it requires amino acids.
Protein-rich foods such as meat, fish, poultry, eggs, dairy, legumes and soy provide amino acids the body can draw upon to build and repair tissues.
Foods containing connective tissue—such as bone broth, chicken skin, fish skin and slow-cooked cuts of meat—also contain collagen or gelatin directly.
But eating more collagen isn't the only consideration. The body also needs specific nutrients to turn those building blocks into new collagen.
Vitamin C Is Essential
Of all the nutrients involved in collagen production, vitamin C is one of the most important.
The body needs vitamin C for key enzymatic steps that stabilise newly formed collagen. Without enough of it, normal collagen synthesis is impaired. This is why severe vitamin C deficiency causes symptoms such as poor wound healing and fragile connective tissue.
Good sources include citrus fruits, berries, kiwi, capsicum, broccoli and leafy vegetables.
This relationship has also prompted researchers to investigate collagen or gelatin together with vitamin C around exercise, when connective tissues are being mechanically stimulated. Early research suggests this combination may support collagen synthesis, although the optimal dose and timing are still being studied.
Don't Forget Zinc and Copper
Zinc and copper also contribute to normal connective-tissue formation and repair.
Zinc is involved in protein synthesis, cell growth and wound healing, while copper is required by enzymes that help cross-link collagen fibres, giving connective tissues strength and stability.
Rather than thinking of collagen production as dependent on one “hero” nutrient, it is better understood as a process requiring adequate protein alongside a range of vitamins and minerals.
Where Collagen Peptides Fit In
A balanced diet provides the nutrients needed to make collagen. Collagen peptide supplementation offers a more concentrated source of collagen-specific amino acids and peptides.
As we discussed earlier, hydrolysed collagen provides high levels of glycine, proline and hydroxyproline. Some smaller peptides can also enter the circulation intact and may have signalling effects on cells involved in connective-tissue metabolism.
This makes collagen peptides different from simply adding more general dietary protein—particularly when the goal is to support collagen-rich tissues such as joints, tendons, ligaments and bone.
Not All Collagen Comes From Animals
Traditionally, collagen supplements have been derived from animal tissues. Bovine collagen typically comes from cattle hides and bones, marine collagen from fish skin and scales, while porcine and poultry tissues can also provide different forms of collagen.
But animal tissue is no longer the only way to produce collagen.
Advances in biotechnology are making it possible to produce non-animal collagen and collagen-like proteins through fermentation. Instead of extracting collagen from hides, bones or skin, microorganisms are used as biological production systems to create specific proteins or peptides under controlled manufacturing conditions.
Advances in biotechnology are making it possible to produce non-animal collagen and collagen-like proteins through fermentation. Instead of extracting collagen from hides, bones or skin, microorganisms are used as biological production systems to create specific proteins or peptides under controlled manufacturing conditions.
Fermentation-derived products can instead contain proteins designed to share structural characteristics with particular types of collagen. For example, PearlRx Collagen 99 uses COLLAWISE™, a non-animal, fermentation-derived collagen that shares structural features with human Type III collagen.
This emerging technology also raises an interesting question about where our supplements come from. Conventional animal-derived collagen makes use of valuable animal by-products, but it remains connected to livestock or seafood supply chains and requires multiple stages of extraction and processing. We explore that journey—and its environmental considerations—in Acid Washes and Carbon Footprints: The Processing of Animal-Derived Collagen.
Fermentation technology now makes it possible to produce collagen without animal sources, reducing reliance on livestock and the associated environmental burden. It represents an important advancement in how collagen can be produced and offers consumers a new alternative with fewer ties to resource-intensive animal supply chains.
Built to Move
Our bodies are designed to move. But movement depends on more than muscle.
Every step, stretch and lift relies on a network of collagen-rich tissues working together—cartilage absorbing pressure, tendons transferring force, ligaments stabilising joints and bones providing the framework beneath it all.
These structures also need to repair and renew themselves throughout life.
As a surgeon, I view healthy ageing as the total package: looking great, feeling great, and keeping your body performing at its peak. It’s about maintaining the energy, strength, mobility, and recovery needed to stay active and independent—proactively doing what supports us physically, mentally, and emotionally.
Dr Pearlie Tan, Founder of PPS Wellness
Looking after collagen is therefore about more than skin. It is about supporting the physical framework that allows us to move, recover and remain resilient for longer.
