longevity cosmetics

The skin: a key organ for longevity

Written by EMA TAILLANDIER on April 27, 2026, updated on April 27, 2026

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Summary

A fully-fledged body

The skin accounts for about 15% of body weight. It is the largest organ in the human body. And yet, in the collective imagination, it remains merely a covering—something we see, touch, and care for on the surface.

The biological reality is far more complex. The skin plays an active role in homeostasis, the fundamental mechanism by which the body maintains its internal balance. It regulates body temperature, synthesizes vitamin D, coordinates immune responses, and detects environmental signals. It serves as a barrier, a sensor, a regulator, and a communicator.

Understanding this changes the way we think about care. We no longer treat a symptom; we support a system.

Three-dimensional architecture

The skin is not a single layer. It is a layered structure composed of interdependent components, each of which plays a specific role, and whose interaction determines the overall quality and longevity the skin.

The epidermis, the outermost layer of the skin, is composed mainly of keratinocytes. It is constantly renewing itself; it is the visible layer that gives the skin its radiance, texture, and even appearance. It also serves as the first line of defense against external aggressors.

Beneath the epidermis lies the dermis, the true foundation of the skin’s structure. This is where fibroblasts reside—cells that play a fundamental yet often overlooked role. They produce collagen, elastin, and glycosaminoglycans: the components of the extracellular matrix that give the skin its firmness, elasticity, and density.

Deeper down,the hypodermis—a layer of fatty tissue—provides mechanical protection and thermal insulation. It contributes to the skin’s shape, contours, and the fullness we feel when we touch it.

These three layers do not operate in isolation. They constantly communicate via biochemical signals that coordinate regeneration, repair, and the response to stressors. It is this dynamic interplay that lies at the heart of longevity .

What causes biological aging of the skin

Skin aging is not simply a matter of wear and tear. It is a series of precise biological mechanisms, identified by science, that gradually alter how cells function.

There are two complementary aspects to aging. Intrinsic aging, which is genetically programmed and progresses over time regardless of the environment. And extrinsic aging, which can be partially influenced and is caused by repeated exposure to UV rays, oxidative stress, pollution, and hormonal fluctuations.

At the cellular level, fibroblast senescence is one of the most significant processes. As we age, these cells produce less collagen, and the breakdown of existing fibers accelerates. Elastin breaks down. Dermal density decreases. What we see on the surface—sagging, wrinkles, loss of firmness—is merely the visible manifestation of a transformation that began much earlier, deep within.

Glycation—the process by which skin proteins become stiffened due to the effects of sugars—also plays a role in this process. It impairs the quality of collagen and accelerates the loss of skin elasticity.

Understanding these mechanisms means understanding where and how to take action.

Fibroblasts: the silent architects of your skin

In the field of longevity , fibroblasts play a central role. They are responsible for producing and maintaining the extracellular matrix—the network of proteins and polysaccharides that provides the skin with structure, cohesion, resilience, and the ability to withstand external stressors.

When fibroblasts function properly, the skin is dense, firm, and capable of repairing itself. When their activity declines due to aging, UV exposure, and oxidative stress, the matrix becomes disorganized. The skin gradually loses its structure.

It is precisely at this level of action that the NEO-REGEN technology from Botanique Avancée Laboratories works by supporting the cellular mechanisms that enable the skin to maintain its structure over time.

The skin microbiome: the invisible ecosystem

A few years ago, discussing the microbiome in a cosmetic context was considered cutting-edge research. Today, it is one of the most dynamic frontiers in dermatology and scientific cosmetics.

The skin is home to billions of microorganisms: bacteria, fungi, and viruses. Together, they form an ecosystem of remarkable complexity. This microbial balance plays a vital role in protecting against pathogens, regulating skin pH, and modulating inflammatory responses.

A microbiome thrown out of balance by overly harsh skincare products, an unsuitable routine, or environmental factors weakens the skin. It becomes more reactive, more vulnerable, and less able to maintain its balance. longevity also depends on preserving this invisible ecosystem.

longevity : between science and reality

longevity become one of the most extensively studied topics in contemporary biology. Approaches such as those developed by Bryan Johnson aim to optimize biomarkers of aging: chronic inflammation, cellular metabolism, sleep quality, and the biological age of tissues.

This research is inspiring. But it also reminds us of a fundamental truth: we cannot stop aging. We can, however, influence the conditions under which it occurs.

This is where the research of Prof. Jean-Marc Lemaître (INSERM) offers a particularly valuable perspective. His work on cellular reprogramming shows that it is possible to restore certain functional capabilities in aging cells—not by artificially rejuvenating them, but by restoring the conditions necessary for them to function optimally.

This philosophy is at the heart of our approach: not to correct, but to support and extend

Regeneration: a process to be preserved, not forced

The skin regenerates throughout a person's lifetime. This is one of its most remarkable biological characteristics. Epidermal stem cells ensure the continuous renewal of the epidermis, maintaining the integrity of the skin barrier and removing damaged cells.

As we age, this process slows down. The renewal cycle becomes longer. Dead skin cells accumulate more on the surface. The skin loses its radiance, its texture becomes less even, and its ability to repair itself decreases.

The goal is not to artificially speed up this cycle. It is to maintain the biological conditions that allow it to proceed properly by supporting cellular mechanisms, limiting factors that cause damage, and providing the skin with what it needs to function at its optimal pace.

This is what LBA calls "skinspan": the skin's optimal cellular lifespan. It is not a promise of eternal youth, but a scientific approach to maintaining skin vitality over time.

Q&A

Why should we consider the skin a vital organ?

Because it performs essential biological functions that go far beyond physical protection: thermal regulation, vitamin synthesis, immunity, and sensory perception. Its proper functioning is key to the body’s overall balance.

What are the main factors that cause skin aging?

UV exposure is the most significant external factor; it causes DNA damage and activates enzymes that break down collagen. Oxidative stress, pollution, glycation, and hormonal imbalances also play a significant role.

What role do fibroblasts play in longevity ?

Fibroblasts produce and maintain the extracellular matrix: collagen, elastin, and glycosaminoglycans. They are the architects of the skin’s structure. Their gradual decline with age is one of the main causes of loss of skin firmness and density.

What is the extracellular matrix?

It is the network of proteins and molecules that gives the dermis its structure and provides it with cohesion, strength, and elasticity. Its breakdown is one of the most visible signs of skin aging.

Does the skin microbiome influence aging?

A balanced microbiome helps maintain the skin barrier, regulate pH, and limit chronic inflammation—one of the drivers of cellular aging. Preserving it is a key factor in longevity .

Can we really slow down skin aging?

We can’t stop it, but we can influence its progression by supporting the skin’s natural regenerative processes, limiting factors that contribute to skin damage, and maintaining a healthy environment for the skin. That’s our approach.

What is Skinspan?

This is the concept developed by Laboratoires Botanique Avancée to describe the skin’s optimal cellular lifespan—its ability to maintain its biological functions over time. It is a vision of longevity that goes beyond aesthetics to address the skin’s true vitality.

Does the skin regenerate throughout one's entire life?

Yes, but at an increasingly slower rate. Epidermal stem cells ensure continuous renewal throughout life. The challenge is to preserve this ability by maintaining the biological conditions that make it possible.