Can We Measure Collagen in the Skin?
Yes — although not by simply counting individual collagen fibres. At Santi Skin Lab we use high-frequency ultrasound to look beneath the surface of the skin and objectively track characteristics of the collagen-rich dermis over time.
We combine ultrasound imaging with measurements of elasticity, wrinkles and texture, hydration and transepidermal water loss to build a much more complete picture of skin structure and change.
Can collagen actually be measured?
We can objectively image and assess the collagen-rich dermis — but it is important to be precise about what that means.
A non-invasive ultrasound scan does not chemically identify every collagen molecule or count individual collagen fibres in the way that laboratory analysis of a tissue sample can.
What high-frequency ultrasound does allow us to do is visualise the dermis beneath the skin surface and quantify characteristics such as dermal thickness and echogenicity.
Because collagen is a major structural component of the dermis, these measurements provide objective information about the collagen-rich dermal matrix and allow us to track changes over time.
Why does collagen matter?
Collagen provides much of the structural framework of the dermis. Together with elastin, glycosaminoglycans and other components of the extracellular matrix, it contributes to the skin's strength, support and mechanical properties.
With ageing, ultraviolet exposure and other environmental and biological influences, the dermal matrix changes. Collagen production, organisation and degradation all contribute to the visible signs associated with skin ageing.
This is one reason why the word collagen appears so frequently in skincare and aesthetic medicine.
Looking beneath the surface
Standardised photography is useful for documenting visible changes at the surface of the skin. Collagen, however, is predominantly located within the dermis beneath that surface.
High-frequency ultrasound gives us another perspective. Sound waves travel into the skin and return signals from tissue structures, creating an image of the skin layers.
This allows the dermis to be assessed non-invasively and the same measurements to be repeated over time.
Dermal thickness
Ultrasound can be used to measure the thickness of the dermis and compare measurements at different time points using a standardised protocol.
Echogenicity
The strength and pattern of returning ultrasound signals provide information about tissue characteristics within the dermis.
Dermal structure
Repeated imaging allows characteristics of the collagen-rich dermal layer to be compared longitudinally.
Does ultrasound directly measure collagen?
Not in the same sense as a biopsy followed by histological or biochemical analysis.
Ultrasound measures the acoustic characteristics of tissue. Because collagen is a major structural component of the dermis, changes in dermal thickness, echogenicity and ultrasound appearance can provide objective information about changes within the collagen-rich extracellular matrix.
For this reason, we describe the technique as high-frequency ultrasound imaging and objective assessment of the collagen-rich dermis rather than suggesting that an ultrasound scan literally counts collagen fibres.
What are you seeing in the ultrasound image above?
The ultrasound image in the hero was captured during a skincare efficacy study conducted at Santi Skin Lab.
Rather than relying only on photographs or asking whether the skin “looks better”, ultrasound allowed characteristics within the dermis to be recorded and compared during the study.
We don't rely on ultrasound alone
Skin is a complex biological organ. No single number can adequately describe whether it has improved.
This is why Skin Lab combines structural imaging with measurements of skin function, mechanical behaviour and visible surface change.
Dermal imaging, thickness, structure and echogenicity.
Objective assessment of the skin's mechanical response and recoil.
Tracking visible surface characteristics and changes over time.
Measurement of water within the superficial layers of the skin.
Transepidermal water loss provides information about skin-barrier function.
What does each measurement tell us?
| Measurement | What it tells us | Relationship to collagen |
|---|---|---|
| High-frequency ultrasound | Images the skin beneath the surface and allows characteristics such as dermal thickness and echogenicity to be quantified. | Provides objective information about the collagen-rich dermal matrix, although it does not chemically identify or count individual collagen fibres. |
| Elasticity | Measures mechanical behaviour such as deformation and recoil. | Reflects the functional behaviour of the skin's structural matrix, including collagen and elastin, but is not a direct collagen count. |
| Wrinkles & texture | Tracks characteristics visible at the skin surface. | Surface appearance can reflect underlying structural changes but is influenced by multiple factors. |
| Hydration | Assesses water content within the superficial layers of the skin. | Useful for assessing skin condition but does not directly measure collagen. |
| TEWL | Measures water loss through the epidermis and provides information about skin-barrier function. | Important for skin health but not a direct measurement of collagen. |
| Photography | Documents visible appearance under standardised conditions. | Useful for before-and-after comparison but cannot itself show what is happening inside the dermis. |
Moving beyond “collagen boosting”
The term collagen stimulating is used extensively in skincare and aesthetic medicine.
A skincare product may claim to support collagen. Microneedling may be used with the aim of stimulating dermal remodelling. Lasers can initiate a wound-healing response followed by tissue remodelling. Injectable treatments may also be used with the aim of improving skin quality.
But understanding a biological mechanism does not tell us how much measurable change has occurred in one individual's skin.
This is where objective measurement becomes particularly useful.
Establish an objective starting point before introducing the treatment or skincare programme.
Follow the defined treatment, skincare or product protocol.
Repeat measurements under comparable conditions after an appropriate interval.
Compare structural, functional and visual measurements rather than relying on impression alone.
Can we measure whether skincare is working?
This is one of the particularly interesting applications of Skin Lab.
A structured skincare study can establish baseline measurements before a product or regimen is introduced and repeat those measurements after a defined period.
Establish the baseline
Ultrasound and other skin measurements establish the condition of the skin before the product or regimen is introduced.
Repeat the measurements
The same measurements can be repeated after a defined period, allowing objective changes to be compared with baseline.
Can we track dermal change after aesthetic treatments?
Potentially. The appropriate measurement protocol and time interval depend on the treatment and the biological process being investigated.
CO₂ Laser
Fractional and ablative CO₂ treatments create controlled thermal injury followed by a prolonged process of repair and dermal remodelling.
Explore CO₂ Laser →Microneedling
Microneedling creates controlled micro-injury and is commonly used where improvement in skin texture and dermal remodelling is part of the treatment aim.
Explore Microneedling →PRP
Platelet-rich plasma is used in regenerative aesthetic protocols where tissue signalling and repair form part of the treatment rationale.
Explore PRP →Polynucleotides
Polynucleotide treatments are used with the aim of improving skin quality and supporting regenerative processes within the tissue.
Explore Skin Boosters →Skincare
Structured skincare trials can combine ultrasound with hydration, TEWL, elasticity and surface analysis to assess change over time.
Explore Skin Lab →Combination programmes
Skin Lab can provide baseline and follow-up measurements where several interventions are used, although attributing a change to one component becomes more difficult.
Ask Santi →When should measurements be repeated?
There is no single correct time point.
Hydration and barrier measurements can change relatively quickly, whereas dermal remodelling following treatments intended to stimulate collagen can evolve over considerably longer periods.
For this reason, the measurement schedule should reflect what is being investigated. Depending on the intervention, this might involve baseline assessment followed by measurements at defined intervals over subsequent weeks or months.
The important principle is to establish the measurement protocol before looking at the result.
What Skin Lab can measure — and what we don't claim
What we can do
- Image the dermis non-invasively
- Measure dermal thickness
- Assess ultrasound characteristics including echogenicity
- Repeat measurements longitudinally
- Measure elasticity and recoil
- Measure hydration
- Measure TEWL
- Assess surface texture and wrinkles
- Combine multiple objective measurements
- Use standardised before-and-after assessment
What we don't claim
- To count every collagen fibre using ultrasound
- That every ultrasound change is caused solely by collagen
- That a visible improvement automatically proves new collagen synthesis
- That one measurement tells the entire story of skin ageing
- That every treatment produces the same response in every person
Collagen Measurement FAQs
Can collagen be measured in the skin?
Collagen can be assessed in different ways depending on the level of precision required. At Santi Skin Lab we use high-frequency ultrasound to image the dermis and objectively track characteristics including dermal thickness and echogenicity. These measurements provide information about the collagen-rich dermal matrix but do not count individual collagen fibres.
Does ultrasound show collagen?
High-frequency ultrasound visualises the dermis, of which collagen is a major structural component. The ultrasound signal provides information about tissue characteristics within this layer. It is not the same as microscopic or histological identification of individual collagen fibres.
What does echogenicity mean?
Echogenicity describes the way tissue reflects ultrasound waves. Differences in the strength and distribution of these reflected signals can provide information about the characteristics of the tissue being imaged.
Is ultrasound better than before-and-after photography?
They provide different information. Photography records visible surface appearance, whereas ultrasound provides information from beneath the skin surface. Using both can provide a more complete assessment than relying on either method alone.
Why does Santi also measure skin elasticity?
Elasticity provides functional information about how the skin deforms and recoils. It complements structural imaging because collagen, elastin and other components of the extracellular matrix contribute to the mechanical behaviour of skin.
What is TEWL?
TEWL stands for transepidermal water loss. It measures water passing through the epidermis and provides information about skin-barrier function. It does not directly measure collagen.
Can Skin Lab measure whether my skincare is working?
Skin Lab can establish objective baseline measurements and repeat them after a defined period of skincare use. Depending on the protocol, measurements may include ultrasound, hydration, TEWL, elasticity, texture and standardised photography.
Can you measure changes after CO₂ laser?
High-frequency ultrasound can be used to track characteristics of the dermis over time. Because remodelling following CO₂ laser evolves over a period of months, measurement timing and standardisation are important when interpreting changes.
Can you measure an increase in collagen after microneedling?
Ultrasound and other Skin Lab measurements can be used to compare the dermis before and after a treatment programme. However, an ultrasound change should be described as a change in measured dermal characteristics rather than as a literal count of newly created collagen fibres.
Why not simply judge the result by looking at the skin?
Visual appearance matters, but it is subjective and primarily shows the surface. Instrumental measurements allow changes in skin structure, mechanics, hydration and barrier function to be considered alongside photography.
Measure first. Treat intelligently. Measure again.
Skin Lab is designed to replace guesswork with objective information. By combining high-frequency ultrasound with measurements of elasticity, hydration, barrier function and surface characteristics, we can establish a detailed baseline and track how the skin changes over time.
Santi London · 33 Thurloe Street · South Kensington · London SW7 2LQ
Skin measurements require appropriate interpretation. High-frequency ultrasound assessment of the dermis is not equivalent to histological analysis of a skin biopsy and should not be represented as a literal count of individual collagen fibres.