For years, skincare marketing has suggested that calm skin isn’t doing enough, that irritation is a sign of effectiveness, that microinjury is necessary for getting skin to respond, and that barrier repair is secondary to actives. That narrative was built on incomplete biology.
Skin does not need to be attacked to rebuild itself.
It needs the right conditions to function.
Epidermal health matters more than aggressive skincare.
Most anti-aging skincare still operates on a decades-old assumption:
If you want more collagen, you have to stimulate fibroblasts.
That belief produced an industry built around irritation-as-virtue (exfoliate harder, peel deeper, inflame faster) under the assumption that damage provokes repair.
If it’s burning, it’s working… right?
Wrong.
Skin biology now tells a more nuanced (and far less violent) story.
Yes, fibroblasts do synthesize the majority of dermal collagen.
That part was never wrong, but what was missing is the role of keratinocytes (you know, (the primary cells that make up the epidermis and skin barrier) in regulating the signals that tell fibroblasts how to behave in the first place.
Keratinocytes have now been found to help determine whether fibroblasts:
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support collagen synthesis
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shift toward matrix breakdown
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or enter stress and survival modes that accelerate visible aging
So what does that actually mean?
Plain and simple: if your skin barrier isn’t healthy or properly maintained, no amount of aggressive actives or treatments will help you build better collagen.
In fact, chronic inflammation and barrier disruption are far more likely to impair collagen quality, increase collagen degradation, and make skin appear thinner, rougher, and older over time.
So everything you’ve been taught is anti-aging is potentially causing you to age more.
Collagen responds to stable, well-regulated conditions, not aggressive over-treatment or constant inflammatory stress.
This is the biological foundation ETHYST has been built on since it launched in 2022.
Skin is a signaling system, not a stack of layers
The epidermis and dermis are often described as separate layers, but biologically they do not function as independent compartments.
They exist in continuous biochemical dialogue, exchanging signals that determine how skin repairs, remodels, and ages over time.
Ok, we’re going to get a little scientifically dense, but stick with me.
Keratinocytes aren’t passive barrier cells. They’re active signaling cells that constantly interpret the skin’s external and internal conditions, including barrier integrity, inflammation, hydration levels, and environmental stress. Based on these conditions, keratinocytes generate molecular signals that communicate downward to the dermis.
These signals include inflammatory messengers (such as IL-1 and IL-6), which keratinocytes release when the skin is irritated, injured, or under stress. These molecules act like internal alarm bells, telling deeper skin cells that the environment is hostile and that resources should be diverted away from long term repair (aka anti-aging processes).
Keratinocytes also release growth factors such as TGF-β and fibroblast growth factors. These help regulate whether fibroblasts focus on maintaining and rebuilding structural proteins like collagen, or shift their behavior toward repair or shutdown depending on conditions.
In addition, keratinocytes produce lipid-based messengers that reflect the health of the skin barrier itself. When the barrier is intact and balanced, these lipid signals reinforce stability and normal cell function. When the barrier’s disrupted, those signals change, further reinforcing stress responses for repair deeper in the skin.
Finally, keratinocytes release tiny packages called extracellular vesicles that carry microRNAs, which are short genetic regulators that can directly influence how fibroblasts turn genes on or off. These messages fine tune fibroblast behavior at a cellular level, shaping how collagen is produced, organized, or broken down.
So all of that to say, that together, these signals form the biochemical “climate” fibroblasts live in. That environment ultimately governs how fibroblasts behave and determines whether collagen maintenance is supported or whether breakdown and aging processes are accelerated.
This idea (that collagen production depends on the skin’s overall condition, not just forcing the skin to “make more collagen” through stimulation) is reinforced by recent developmental biology research.
A 2025 study published in Nature Communications showed that during axolotl skin development, epidermal keratinocytes actively help shape dermal collagen architecture, while fibroblasts later modify and remodel that structure (Ohashi et al., 2025).
Because axolotl skin shares the same fundamental epidermis-dermis organization found in human skin, the study reinforces an important principle that extends beyond species: collagen behavior is not controlled by fibroblasts alone, but is shaped by upstream epidermal signaling and the overall skin environment.
When the epidermis is calm, intact, and well regulated (with a barrier-supportive, biological skincare system like ETHYST) keratinocyte signaling supports balanced collagen turnover and long term structural maintenance.
When the epidermis is chronically irritated, inflamed, or barrier-impaired (like it is when using multiple harsh actives and aggressive treatments), that signaling environment shifts. Fibroblasts adapt to ongoing stress by reducing collagen production, increasing matrix breakdown, and prioritizing survival over repair.
In other words, fibroblasts don’t operate independently. They respond to the biochemical environment they’re embedded in: an environment largely shaped by keratinocyte signaling and overall epidermal (skin barrier) health.
When the epidermis is stressed, keratinocytes are among the first cells to register that something is wrong at the skin’s surface. Barrier disruption, chronic irritation, UV exposure, inflammation, and repeated over-exfoliation are all interpreted as stress signals. When this happens, keratinocytes respond by releasing inflammatory messengers (particularly cytokines like the IL-1 ones mentioned above) that communicate danger to the deeper layers of the skin.
These signals directly influence how fibroblasts behave. In a stressed environment, fibroblasts receive the message that conditions are unstable and potentially hostile. Instead of prioritizing long term maintenance tasks like organized collagen production, they shift toward survival mode.
Collagen synthesis slows, collagen-degrading enzymes become more active, and the extracellular matrix (the structure, made of proteins like collagen and elastin, that holds skin together and helps skin cells know how to function.) becomes increasingly disorganized.
That’s why, over time, chronic inflammation leads to poorer collagen quality, slower recovery, increased fragility, and skin that appears thinner, rougher, older, and more easily compromised.
The skin is responding appropriately to an environment that doesn’t feel safe.
However, when the epidermis is calm, well hydrated, and the barrier is intact, keratinocyte signaling looks very different. Since the skin is not broadcasting distress, it sends signals associated with balance, repair, and regulation. Growth factor pathways (such as those involving TGF-β mentioned above) are favored, supporting normal collagen synthesis and controlled remodeling within the dermis.
This means collagen turnover remains steadily functional vs being forced or artificially stimulated. Old collagen is broken down at an appropriate pace, new collagen is produced in an organized way, and the overall structure of the skin remains resilient and adaptable.
This is what youthful skin actually looks like at a biological level. Skin that is well regulated, responsive, and structurally supported instead of constantly inflamed or aggressively treated.
Strong Skin Matters because healthy skin is stable skin.
Since cells prioritize survival over regeneration when stress is ongoing, the “attack to rebuild” concept fails long term.
There’s an important distinction between short term injury and chronic stress. Acute injury can technically trigger repair responses, but they only work if they are done in a controlled way within the context of a resilient skin barrier.
Chronic inflammation drives degeneration.
Many modern skin concerns, including persistent redness, thinning, crepiness, and delayed healing, are not signs that skin needs stronger actives. They’re signs that inflammatory signaling has never fully resolved. Aggressive skincare often mistakes visible inflammation or physical sensations, like burning, for productivity, assuming that irritation equals progress.
Biology doesn’t work that way.
So we must reframe anti-aging correctly.
Collagen loss isn’t simply a dermal problem. It is a skin environment problem.
Supporting collagen long term means protecting the epidermal barrier, minimizing unnecessary inflammatory signaling, preserving keratinocyte function, and allowing fibroblasts to operate in a cooperative, well-regulated environment. When these conditions are met, collagen creation and maintenance happens as a natural outcome of healthy skin function.
That’s why approaches centered on resilience, barrier biology, and cellular regulation consistently outperform “stimulate harder” strategies over time. The more biologically accurate, the better the results.
And that more than validates the ETHYST philosophy.
Understanding that overall skin health precedes skin youth has been the biological foundation of ETHYST since its launch in 2022. And as research continues to catch up, the message becomes clearer: keeping skin healthy isn’t just supportive care.
It’s the entire strategy.
