Why does skin stop bouncing back the way it used to?
You may first notice it around your eyes, along your jawline, or when your skin doesn't return to its original position as quickly after being stretched.
It's easy to describe these changes as a loss of collagen.
But collagen is only part of the story.
Your skin also contains elastin, a protein that helps it stretch and return toward its original shape.
Together, collagen and elastin contribute to the skin's mechanical properties, including firmness, flexibility and resilience.
As we age, the structure and organization of these proteins change. Sun exposure, environmental stress and biological aging can also affect how the skin functions.
Researchers are now investigating whether certain skincare ingredients, nutritional compounds and other interventions can influence measurable aspects of skin elasticity.
But an important question remains:
When a study reports improved skin elasticity, what actually changed and does that mean the skin became biologically younger?
Understanding that difference is essential when evaluating skin-aging research.
What Is Skin Elasticity?
Skin elasticity describes the skin's ability to deform under force and recover after that force is removed.
When you gently stretch or pinch your skin, several structures contribute to how it responds.
The dermis, the deeper layer beneath the epidermis, contains an extracellular matrix made up of structural proteins and other molecules.
Among its most important components are collagen, elastin and glycosaminoglycans, including hyaluronic acid.
These components contribute to different aspects of skin behavior.
Collagen provides tensile strength and structural support.
Elastin helps tissues stretch and recoil.
Hyaluronic acid contributes to hydration and the physical properties of the extracellular environment.
Healthy skin depends on the interaction of these components rather than any single molecule.
That is why skin elasticity cannot be fully explained by collagen concentration alone.
Elastin: The Protein Behind Skin Recoil
Elastin is one of the major proteins responsible for the elastic properties of connective tissues.
Within the dermis, elastin forms part of an elastic-fiber network that helps skin recover after stretching.
These fibers contain an elastin-rich core supported by associated microfibrillar proteins, including fibrillin.
Unlike many proteins that are continuously replaced, elastin is relatively long-lived.
Its production is particularly active during early development, while replacement in adult tissues is limited.
That makes maintaining the existing elastic-fiber network especially important.
Over time, structural damage and changes in the organization of elastic fibers can reduce the skin's ability to recover from deformation.
This helps explain why older skin may feel less resilient even when it remains adequately hydrated.
Does Skin Lose Elastin With Age?
The answer is more complicated than simply saying elastin disappears.
Intrinsic aging can involve changes in the organization, integrity and function of dermal elastic fibers.
Meanwhile, chronic ultraviolet exposure can cause a different pattern of damage known as solar elastosis.
In sun-damaged skin, abnormal elastin-containing material can accumulate within the dermis.
That means photoaged skin can contain substantial amounts of abnormal elastic material while still displaying reduced elasticity.
The issue isn't always how much elastin is present.
The structure, organization and functional quality of elastic fibers also matter.
Collagen: Why Skin Needs Structural Strength
Collagen is the most abundant structural protein in the dermis.
Types I and III collagen are particularly important to the skin's connective-tissue architecture.
Collagen fibers provide resistance to stretching forces and help maintain structural support.
As skin ages, several changes can occur.
Dermal fibroblasts may become less effective at maintaining the extracellular matrix. Collagen synthesis can decrease, existing fibers can become fragmented, and changes in matrix-remodeling enzymes can influence the balance between collagen production and degradation.
Ultraviolet radiation can accelerate some of these processes by activating signaling pathways associated with collagen breakdown.
The resulting changes contribute to wrinkles, reduced firmness and alterations in skin texture.
But collagen and elastin perform different functions.
Collagen helps skin resist mechanical forces, while elastin contributes to its ability to recover after stretching.
A product or intervention that affects collagen-related measurements therefore does not automatically improve every aspect of skin elasticity.
Why Does Skin Elasticity Decline With Age?
Skin aging involves both intrinsic and extrinsic processes.
Intrinsic aging refers to biological changes associated with the passage of time, including alterations in cellular activity, extracellular-matrix maintenance and tissue structure.
Extrinsic aging reflects environmental influences, particularly chronic ultraviolet exposure.
These processes interact.
Changes in Fibroblast Activity
Fibroblasts are cells within the dermis that produce and maintain components of the extracellular matrix.
With aging, changes in fibroblast function can affect collagen production, matrix organization and tissue repair.
Fragmentation of Structural Fibers
Collagen and elastic fibers can undergo structural alterations that reduce their mechanical effectiveness.
Ultraviolet Exposure
Long-term exposure to ultraviolet radiation contributes to photoaging.
It can promote oxidative stress, activate matrix-degrading enzymes and alter both collagen and elastic-fiber networks.
Glycation
Advanced glycation end products can form cross-links in long-lived proteins, including collagen.
These modifications may influence tissue stiffness and flexibility.
Changes in Hydration
Skin hydration also affects how skin looks and feels.
However, hydration and elasticity are not identical measurements.
A moisturizer may temporarily improve skin smoothness and hydration without demonstrating that damaged elastic fibers have been rebuilt.
These overlapping mechanisms help explain why skin aging cannot be reduced to one protein deficiency.
How Do Researchers Actually Measure Skin Elasticity?
When a clinical study claims that an intervention improves skin elasticity, the measurement method matters.
Researchers use several instruments to evaluate different mechanical and structural properties of skin.
Cutometer Measurements
A Cutometer is commonly used in dermatological research.
The device applies controlled suction to a small area of skin and measures how the tissue deforms and recovers.
Different parameters can describe aspects of skin deformation, immediate recovery, overall elasticity and related mechanical behavior.
For example, researchers may report measurements such as R2, R5 or R7.
These parameters are related but are not interchangeable.
A statistically significant improvement in one parameter does not necessarily mean every aspect of skin elasticity improved.
Imaging and Ultrasound
High-frequency ultrasound and other imaging techniques can help researchers examine skin thickness and aspects of dermal structure.
However, changes in skin thickness do not automatically prove that elastin or collagen production increased.
Wrinkle and Surface Measurements
Three-dimensional imaging and skin-surface analysis can quantify wrinkle depth, roughness and other visible features.
These are useful cosmetic endpoints.
But smoother skin is not the same as direct evidence of elastic-fiber regeneration.
Skin Hydration Measurements
Devices such as corneometers assess aspects of skin hydration.
Improved hydration can be a meaningful cosmetic benefit, but it should not be confused with proof that the underlying dermal matrix has been rebuilt.
The key question is not simply whether a skin measurement improved. It is what the measurement actually represents.
What Have Human Studies Found About Elastin?
Researchers have investigated whether oral elastin-derived peptides can influence skin-related measurements.
One randomized, double-blind, placebo-controlled study published in 2024 examined a specific bonito fish-derived elastin peptide preparation.
The study enrolled 100 healthy Korean adults and investigated a daily intake of 100 mg of the studied elastin peptide preparation for 12 weeks.
Researchers evaluated several skin-related endpoints, including wrinkle characteristics, hydration and other biophysical properties.
The authors reported improvements in selected measurements compared with placebo.
The study is interesting because it tested a defined elastin-derived ingredient in humans rather than relying entirely on cell or animal experiments.
Study: Seong SH and colleagues, 2024
PMID: 38481080
However, several distinctions are important.
First, the study investigated a specific bonito-derived elastin peptide preparation. Its findings cannot automatically be generalized to every marine elastin supplement.
Second, changes in skin biophysical measurements do not prove that ingested elastin peptides were incorporated directly into the skin's elastic fibers.
Third, a 12-week trial cannot establish whether effects persist over years or meaningfully change the long-term biological aging of skin.
The study provides encouraging evidence for selected skin-related outcomes under the conditions tested.
It does not establish that oral elastin reverses skin aging.
Does Taking Elastin Directly Rebuild Skin Elastin?
This is one of the most important questions to ask when evaluating oral elastin products.
When elastin-derived proteins or peptides are consumed, they enter the digestive system.
They do not simply travel intact from the digestive tract to the dermis and become new elastic fibers.
Digestion, absorption, peptide metabolism and biological signaling all influence what happens after consumption.
Researchers are investigating whether certain elastin-derived peptides may influence skin biology through indirect mechanisms.
But demonstrating improved skin measurements is different from proving direct reconstruction of the dermal elastic-fiber network.
A clinical improvement in elasticity should not automatically be described as rebuilding elastin.
That claim would require more direct mechanistic evidence.
What About Collagen Supplements?
Collagen peptides have also been investigated in human clinical trials involving skin hydration, elasticity and wrinkle-related outcomes.
Some randomized trials and systematic reviews have reported improvements in selected skin measurements.
However, interpretation depends on study quality, formulation, duration, participant characteristics and potential industry funding.
Different collagen preparations are not necessarily interchangeable.
And just as with elastin, consuming collagen peptides does not mean those peptides are directly deposited as intact collagen fibers in the skin.
Researchers need to distinguish between changes in measured skin properties and direct evidence of structural protein regeneration.
This is particularly important when comparing collagen and elastin products.
The two proteins play different biological roles, and evidence for one ingredient should not be used to substantiate claims about the other.
What Does a Statistically Significant Improvement Actually Mean?
Suppose a clinical trial reports that skin elasticity improved significantly after 12 weeks.
That is worth investigating.
But statistical significance alone doesn't tell us whether the improvement was large enough for participants to notice.
Researchers should also consider the size of the effect, the variability between participants and whether the difference was meaningful compared with placebo.
For example, a small change detected by an instrument may be statistically significant without producing a noticeable improvement in everyday appearance.
Conversely, a visible improvement in skin smoothness might be driven partly by hydration rather than deeper structural changes.
This is why strong skin-aging research should report both objective measurements and clear information about the magnitude of the observed effects.
What Are the Biggest Limitations in Skin-Elasticity Research?
Skin-aging trials often face several challenges.
Short study duration: Many studies last only eight to twelve weeks. That can be sufficient to investigate short-term changes, but it doesn't establish long-term effects.
Small participant populations: A relatively small study may not adequately represent different ages, skin types, ethnic backgrounds or levels of sun damage.
Different measurement methods: Trials may use different Cutometer parameters, imaging systems or wrinkle scales, making comparisons difficult.
Formulation differences: Two products described as marine elastin or collagen peptides may differ substantially in their source, molecular composition and dose.
Industry involvement: Commercial sponsorship does not automatically invalidate research, but funding sources and conflicts of interest should be considered when evaluating the evidence.
Limited mechanistic confirmation: Improvements in skin measurements do not necessarily establish exactly which structural changes occurred within the dermis.
These limitations don't mean skin research should be ignored.
They help explain why promising results need independent replication.
Can Skin Elasticity Be Improved Without Reversing Skin Aging?
Yes.
This is an important distinction.
An intervention can improve hydration, surface texture or measured mechanical properties without reversing the underlying biological processes responsible for aging.
For example, improved hydration can temporarily change the appearance and feel of the skin.
Some cosmetic ingredients may influence barrier function, pigmentation or visible texture.
Sun protection can reduce additional ultraviolet damage.
Certain medical and cosmetic procedures may also improve selected aspects of skin appearance.
These can be meaningful outcomes.
But none should automatically be described as reversing biological aging.
The most scientifically useful approach is to describe the specific outcome demonstrated.
If a study measured hydration, discuss hydration.
If it measured wrinkle depth, discuss wrinkle depth.
If it measured elastic recovery, discuss elastic recovery.
The claim should match the endpoint.
What Should You Look for When Evaluating Skin-Aging Research?
Before accepting a claim that an ingredient improves skin elasticity, ask several questions.
Was the study conducted in humans, animals or cultured cells?
Was it randomized and placebo-controlled?
How many participants were included?
How long did the intervention last?
Which ingredient and dose were actually tested?
Was elasticity measured using a validated instrument?
Were the results significantly different from placebo?
Did researchers directly measure changes in collagen or elastic fibers, or only changes in skin appearance?
Were the results independently replicated?
And perhaps most importantly, does the commercial product being advertised contain the same studied ingredient and formulation?
These questions help separate scientifically interesting results from claims that extend beyond the evidence.
Why Skin Elasticity Research Matters
Skin is one of the most visible tissues affected by aging.
But the changes we see at the surface reflect processes occurring deeper within the tissue.
Elastin contributes to recoil. Collagen provides structural support. Fibroblasts maintain the extracellular matrix, while ultraviolet exposure, oxidative stress and other biological processes influence how that matrix changes over time.
Researchers are increasingly able to measure these changes using objective instruments and imaging technologies.
That progress makes it possible to test whether specific interventions influence selected aspects of skin function.
But the goal of good research isn't simply to produce a positive result.
It's to determine what changed, why it changed and whether the effect is meaningful and reproducible.
The Bottom Line
Skin elasticity depends on more than one structural protein.
Collagen helps maintain strength and support, while elastin contributes to stretching and recovery. Both are influenced by intrinsic aging, ultraviolet exposure and changes in the dermal extracellular matrix.
Human studies have reported improvements in selected skin measurements after certain interventions, including research involving specific elastin-derived peptides.
But improvements in hydration, wrinkle appearance or instrument-measured elasticity should not automatically be interpreted as proof that skin elastin was rebuilt or biological aging reversed.
The most important distinction is between measurable cosmetic improvement and demonstrated structural regeneration.
Both are worth studying.
They are not the same claim.
Continue Exploring Skin-Aging Research
Want to understand what scientists are discovering about elastin, collagen and the biology of aging skin?
Explore Aeternum's skin research to learn more about the extracellular matrix, skin elasticity, marine elastin peptides, clinical measurement methods and the limitations of current human evidence.
Learn what human studies actually measured, how to interpret their findings and which questions remain unanswered before evaluating a skincare or nutritional product.
Research Featured in This Article
Seong SH, et al. (2024).
Oral consumption of Bonito fish-derived elastin peptide (VGPG Elastin®) improves biophysical properties in aging skin: A randomized, double-blinded, placebo-controlled study.
Skin Research and Technology.
PMID: 38481080
PMCID: PMC10938029
DOI: 10.1111/srt.13634
A randomized human trial investigating a specific bonito-derived elastin peptide preparation and selected skin biophysical outcomes over 12 weeks.
Shin JW, Kwon SH, Choi JY, et al. (2019).
Molecular Mechanisms of Dermal Aging and Antiaging Approaches.
International Journal of Molecular Sciences.
PMID: 31370209
A review discussing the molecular mechanisms of skin aging, including changes in dermal fibroblasts, collagen, extracellular-matrix remodeling and environmental damage.
Quan T, Fisher GJ. (2015).
Role of Age-Associated Alterations of the Dermal Extracellular Matrix Microenvironment in Human Skin Aging: A Mini-Review.
Gerontology.
PMID: 25471972