How collagen is lost and how to truly protect it

Almost everything you read about collagen concerns how to stimulate its production. That is half the problem, and not the more urgent half.

Because collagen is not lost only because less of it is produced: it is lost above all because more of it is degraded. And anyone focusing entirely on synthesis is filling a bucket without noticing the hole in the bottom.

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Collagen is lost in two ways, not one

Collagen is the protein that gives the dermis its structure, and its quantity depends on a balance between two processes that occur continuously.

On the one hand, fibroblasts produce it anew. On the other, certain enzymes break it down to make room for new fibers: this is physiological turnover, not an error.

The problem begins when the balance shifts. Around the age of twenty-five to thirty, fibroblasts slow down; during the same period, accumulated exposure to UV rays, pollution, and smoke accelerates breakdown. The two curves move in opposite directions, and the distance between them is what shows in the mirror.

That is why a strategy focused solely on stimulation comes too late: if degradation outpaces synthesis, producing more is not enough to recover.

Metalloproteinases: what breaks down collagen

The enzymes responsible are called matrix metalloproteinases, abbreviated as MMPs. The one that acts directly on collagen is MMP-1, also known as collagenase.

MMP-1 is not an external enemy: the skin produces it itself. But its expression increases dramatically in the presence of free radicals, and this is the real mechanism by which the sun ages the skin. UV rays do not «burn» collagen: they induce cells to produce the enzymes that cut it up.

That is also why daily sun protection is the first anti-aging treatment, long before any serum.

Collagen breakdown is one of the mechanisms of skin aging, not the only one. Alongside it are glycation, which stiffens the fibers that are already present; degradation of elastin, which reduces elastic recoil; and low-grade chronic inflammation. These are distinct processes: acting on just one helps explain why certain treatments deliver less than they promise.

There is a third change: not just how much, but which kind

This is the part that is almost always missing from the narrative, and it explains something that seems contradictory to many people: why skin becomes less elastic even though it still contains plenty of collagen.

Dermal collagen is not just one type. The two main types are type I and type III, and they do not serve the same purpose. Type III is more elastic and less fibrous, and it predominates in young skin and repairing tissues—which is why it is called remodeling collagen. Type I is the supporting fiber, the one that provides strength.

The point is that the two work together: it is the abundant presence of type III that allows type I to perform its elastic and supportive functions at its best.

With age, the balance shifts in two ways at once. Fibroblasts produce less and less type III collagen, while type I becomes stiffer because of cross-links that form between the fibers, promoted by free oxygen radicals. In adults, type I accounts for about 80% of dermal collagen and type III for just 15%; the remaining 5% consists mainly of types IV and V.

The practical consequence is important. Even with the same total amount, a dermis with little type III and stiffened type I behaves differently: it is stiffer, less responsive, and slower to repair. It is not just a question of how much collagen there is, but of what kind of collagen it is and what state it is in.

There is also a useful conclusion about antioxidants, which are usually justified only by their reduction of MMPs. If the cross-links that stiffen type I are promoted by free radicals, then an antioxidant does not work only upstream of breakdown: it also helps slow the stiffening of the fibers that are already there. These are two distinct benefits of the same action.

The three levers that can be targeted

Once the mechanism is understood, the points on which a cosmetic product can act become three, and they are distinct.

Most anti-aging products work only on the third. It is the easiest to communicate—“stimulates collagen”—but on its own it is the least efficient, because it does not address the reason why collagen is disappearing.

What does not work: slathered-on collagen

It is worth stating this clearly, because it is the most costly misconception.

Collagen applied to the skin as an ingredient does not rebuild dermal collagen. The molecule is too large to cross the skin barrier: it remains on the surface, where it acts as an excellent film-forming moisturizer. This is a real benefit, but it is hydration, not rebuilding.

A “collagen” cream moisturizes well. If you are looking for an effect on the skin's structure, what matters is not the word collagen on the label: it is the active ingredients that signal to fibroblasts or inhibit enzymes.

The active ingredients that truly protect

The first and second levers—the ones almost no one addresses—are targeted by the Gardenia meristematic cell culture, a biotechnological active ingredient that acts on all three fronts simultaneously.

The manufacturer's in vitro tests on human fibroblasts, using an accelerated-aging model, report statistically significant results for each mechanism.

These are in vitro tests conducted by the manufacturer, obtained using cell cultures and not volunteers: they describe the mechanism and its relative intensity, not the result you will see in the mirror. We report them because they explain how the active ingredient works, and it is right to know where they come from.

The molecule responsible is feruloyl-6-glucoside, a phenylpropanoid that the cell culture produces at a much higher concentration than the plant grown in the field.

Peptides act on the third lever, each through different mechanisms. Matrixyl 3000 mimics the fragments produced by the dermis when collagen breaks down, and fibroblasts interpret it as a repair signal. A collagen fragment produced biotechnologically from a plant does something different: it does not mimic a message; it provides an authentic fragment of the human sequence.

Why they are needed together

Protecting and building are two distinct strategies, and neither one alone solves the equation.

In our serum, we chose to include all three in the same formula: Gardenia, which slows degradation; Matrixyl, which signals to fibroblasts; and the biotechnological fragment, which provides the authentic sequence. Alongside them, hyaluronic acid works for immediate volume, while grape polyphenols combat the free radicals that trigger MMPs.

This isn't a list of ingredients on a label: it's a formula built around the mechanism, from cause to effect. The rest of the anti-aging range is in the LeLang selection of anti-aging treatments.

If you don't know where you are on the curve—whether the problem is already a loss of structure or you're still at the prevention stage—these are two different paths, and starting with the wrong one means waiting months to find out. At LeLang partner pharmacies, you'll find a pharmacist who can help you understand where to start.

What to do beyond cosmetics

Daily sun protection is the single most effective measure because it targets the main cause of increased MMPs. And this is not a theoretical claim: a four-and-a-half-year Australian randomized study measured significantly less skin aging in the group that used it every day.

Smoking also matters, as it increases collagenase production and reduces tissue oxygenation, as does prolonged stress: cortisol interferes with fibroblast activity, and this is one of the reasons why, during difficult periods, the skin appears duller and less firm.

From a dietary standpoint, the elements required for synthesis are needed: vitamin C, essential for the enzyme that stabilizes the fibers, and enough protein to provide the amino acids.

Frequently asked questions

What age is it best to start?

Fibroblasts begin to slow down between the ages of twenty-five and thirty, long before signs become visible. An aggressive treatment is not necessary at that age: daily sun protection and antioxidants are enough. Actives that work on fibroblasts make more sense from the age of thirty-five onward.

Why is my skin less elastic even though I still have collagen?

Because type matters, not just quantity. Type III collagen, the more elastic type, progressively declines with age — in adults, it remains at around 15% compared with 80% for type I — while type I stiffens due to the formation of cross-links promoted by free radicals. The result is a dermis that still has structure but is stiffer and slower to repair.

Do collagen supplements work?

They are a different topic from cosmetics. Oral intake follows a systemic approach, with its own dosages and bioavailability considerations, and does not overlap with what an active applied to the skin does. The two approaches can coexist, but the results of one do not transfer to the other.

How long does it take to see results?

Actives that act on fibroblasts require two months of consistent use before producing noticeable changes in firmness and density. Anyone promising structural results in two weeks is referring to a surface effect, which is something else and disappears with cleansing.

Can collagen be fully restored?

No, and anyone who claims otherwise is not credible. It is possible to slow degradation, support synthesis, and noticeably improve the skin’s firmness and appearance. You cannot rewrite the dermis of a twenty-year-old: you preserve what is there and work to make it last.

Retinol or peptides for collagen?

They act through different pathways and are not mutually exclusive. Peptides are generally better tolerated and are suitable for morning and evening use; retinol is more demanding and requires a gradual introduction. With reactive skin, it is best to start with peptides.

Is sun protection enough on its own?

It is essential and by far the most effective measure, but it works on prevention: it reduces MMP induction; it does not rebuild what has already been lost. For that, you need active ingredients that work on the other two levers.

The sources for this article

01 Fisher G.J., Kang S., Varani J., Bata-Csorgo Z., Wan Y., Datta S., Voorhees J.J., Mechanisms of photoaging and chronological skin aging, Archives of Dermatology, 2002; 138(11): 1462-1470.
02 Quan T., Qin Z., Xia W., Shao Y., Voorhees J.J., Fisher G.J., Matrix-degrading metalloproteinases in photoaging, Journal of Investigative Dermatology Symposium Proceedings, 2009; 14(1): 20-24.
03 Varani J., Dame M.K., Rittie L. et al., Decreased collagen production in chronologically aged skin, American Journal of Pathology, 2006; 168(6): 1861-1868.
04 Hughes M.C., Williams G.M., Baker P., Green A.C., Sunscreen and prevention of skin aging: a randomized trial, Annals of Internal Medicine, 2013; 158(11): 781-790.
05 Manufacturer's in vitro test on Gardenia meristematic cell culture, conducted on human fibroblasts in an accelerated-aging model.

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