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Natural Moisturizing Factors (NMFs): What They Are and Why Skin Needs Them
Natural moisturizing factors are small, water-attracting molecules that skin produces on its own to hold moisture in its outermost layer. We look at what they are made of, how they form from filaggrin, why they matter so much for hydration and the barrier, and how to keep their levels up.
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Skin has its own moisture-holding system, built inside the cells themselves. Understanding it explains why some people have dry skin no matter how much cream they apply, while others barely think about it.
Product routine
Step 1CleanseGentle cleansing that refreshes the skin
Step 2TreatHydrating serum for plumpness and comfort
Step 3MoisturizeLight 120h hydration with no heavy feel
Step 4ProtectDay cream with broad-spectrum SPF 50
What They Are
The natural moisturising factors are a mix of small water-soluble substances sitting inside the cells of the outermost layer. Among them are amino acids, urea, lactic acid, sodium PCA and various salts.
What they have in common is that they attract water and hold it inside the cell. Thanks to them the surface layer stays flexible instead of hardening and starting to crack.
Where they come from
Much of them comes from the breakdown of a protein called filaggrin as cells move toward the surface and die. So the natural moisturising factors are a by-product of normal skin renewal.
How They Fit the Whole Picture
If the barrier is brickwork of cells and lipids, the natural moisturising factors are the water inside the bricks. The lipids outside stop water escaping; these substances inside hold it in place.
So the two systems do not substitute for each other. Skin with enough lipids but depleted moisturising factors will still feel tight. And the reverse holds as well.
What Depletes Them
Being water-soluble, they simply wash away. Every wash removes some, and hot water with harsh cleansers removes considerably more. That is the main reason skin feels tight straight after a shower.
Dry air, winter heating, air conditioning and age all play a part too, since cell renewal slows over time. In some people the level is lower for inherited reasons, which explains a lifelong tendency to dry skin.
How to Support Them
The first and most underrated step is washing. Lukewarm water and a mild cleanser preserve more of what you already have than any cream can put back.
The second is applying to damp skin within a minute of washing. At that point there is still water in the surface layer for the product to hold, rather than having to draw it up from below.
The ingredients that mimic them
On a label you will see urea, sodium PCA, glycerin, betaine, amino acids and lactic acid. These ingredients do essentially what your own moisturising factors do. Hyaluronic acid works similarly, though it is not part of the natural mix.
Urea Deserves a Separate Mention
Urea is among the most useful ingredients for dry skin and at the same time among the most underrated, probably because of its name. At low concentrations it holds water. At higher ones it also gently loosens the bonds between dead cells, which softens rough areas.
That is exactly why creams for very dry skin on the feet and elbows usually contain urea at a higher concentration than facial products do.
Dry or Dehydrated
The distinction is a practical one. Dry skin is a skin type: it produces little sebum and usually stays that way for life. Dehydrated skin is a condition: it lacks water and can happen to anyone, oily skin included.
Dehydration is closely tied to depleted moisturising factors and usually responds quickly. Dry skin also needs lipids, meaning a richer texture, not humectants alone.
What to Expect
The change here is among the fastest in skincare. The sense of tightness usually eases within days, and the look of the surface improves within one to two weeks.
If your skin stays dry despite correct washing and consistent moisturising, the issue is probably not the moisturising factors but the lipids. In that case see our sensitive skin routine, which is built around exactly that.
How to Read the Label
Glycerin is the most common and most underrated humectant. It is inexpensive, well studied and works reliably, so finding it high on an ingredient list is a good sign rather than a mark of a basic formula.
A good formula combines several humectants with different properties rather than relying on one. If you see glycerin, urea or sodium PCA alongside lipids, the product covers both sides of the job.
When a Humectant Works Against You
Humectants draw water from the nearest available source. When the air is dry, that source turns out to be the skin itself, and the water pulled upward evaporates from the surface.
So a humectant-only serum applied to dry skin in winter and left without a cream on top often makes things feel worse. The answer is not to stop using humectants but always to seal them in.
The Habits That Help Most
Shorter, cooler showers. A mild cleanser that does not leave a squeaky-clean feeling. Applying to damp skin. A humidifier in the bedroom in winter if the heating is dry.
These habits cost less than changing products and usually make a more noticeable difference. If your skin is sensitive, the same approach is set out in more detail in our seasonal skincare guide.
Why Skin Sometimes Tightens After a Cream
If you feel tightness soon after applying, the explanation is usually one of two. Either the product is a humectant with nothing to seal the water in, or it went onto skin that had already dried.
In both cases the answer is the order, not a different product. Damp skin, then the humectant, then something richer on top. That sequence resolves most dry-skin complaints without buying anything new.
In Short
The natural moisturising factors are the inner half of the moisture-holding system, and the barrier lipids are the outer half. Skincare works best when it supports both.
The biggest difference, though, does not come from an ingredient but from how you wash. That is the step that either preserves or washes away what your skin already has.
01What is the difference between NMFs and hyaluronic acid?
NMFs are a whole group of small molecules (amino acids, PCA, urea, lactates) that skin produces on its own inside its cells. Hyaluronic acid is one specific humectant that attracts and holds water, mainly at the surface. In a routine the two complement each other: hyaluronic acid brings moisture, and NMFs hold it inside the cells.
02Are NMFs the same as a moisturizer?
No. A moisturizer is a finished product that may contain humectants, lipids and occlusive ingredients. NMFs are the natural substances in the skin itself. A good moisturizer supports and supplements NMFs, but does not fully replace them.
03Can I restore normal NMF levels in my skin?
You cannot apply them directly, but you can create the conditions for skin to hold and produce them better: gentle cleansing, humectants (amino acids, PCA, urea, glycerin, hyaluronic acid), barrier support with lipids, and sun protection. With consistent care, levels recover gradually.
04Why does my skin feel tight after cleansing even though I use a cream?
Tightness often means cleansing is washing away NMFs and damaging the barrier faster than the cream can compensate. Switch to a gentler, pH-balanced cleanser and apply your hydrating product onto slightly damp skin to hold in more water.
05Which ingredients support natural moisturizing factors?
Humectants such as amino acids, PCA, urea, lactic acid, glycerin and hyaluronic acid, combined with barrier ingredients: ceramides, phospholipids, panthenol and squalane. The combination attracts, holds and seals moisture into the skin.
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