Natural Moisturizing Factors (NMF): What They Are and Why Your Skin Needs Them

Healthy skin hydration depends on more than just applying a moisturizer. A major part of the skin’s ability to hold onto water comes from Natural Moisturizing Factors (NMF)—a mix of small, water-binding compounds found in the outer layer of skin.

NMF help keep the stratum corneum (the outermost layer of skin) flexible and comfortable by binding water within the skin barrier. When NMF levels are low, skin may feel dry, tight, rough, or more easily irritated.

This guide explains what natural moisturizing factors are, what they do, why they can decrease, and how skincare habits can help support long-lasting hydration.

What Are Natural Moisturizing Factors (NMF)?

Natural Moisturizing Factors (NMF) are a group of naturally occurring, water-binding compounds located inside the cells of the stratum corneum. They help the outer skin layer maintain adequate water content so it stays smooth and less prone to cracking or flaking. A significant portion of NMF comes from the breakdown of a skin protein called filaggrin.

Common components of NMF include:

• Amino acids

• Pyrrolidone carboxylic acid (PCA) and salts such as sodium PCA

• Urea

• Lactate (salt of lactic acid)

• Inorganic salts/electrolytes (for example, sodium, potassium, chloride)

• Sugars and other small organic acids

Together, these components support hydration in the stratum corneum and help the skin barrier function normally.

What Do Natural Moisturizing Factors Do?

The main role of natural moisturizing factors is to help the stratum corneum keep enough water for comfort and normal barrier performance. Key benefits include:

• Support hydration: NMF bind water within the outer skin layer, helping reduce dryness and tightness.

  
  

• Help the skin barrier work effectively: Well-hydrated corneocytes (outer skin cells) support a more even, intact surface and can help limit excess water loss.

  
  

• Improve texture and smoothness: Adequate water content in the stratum corneum helps reduce roughness and visible flaking.

  
  

• Maintain flexibility: Hydrated skin is generally more supple, which may lower the chance of discomfort from dryness.

What Happens When NMF Levels Decrease?

NMF levels can decrease due to a mix of skincare habits, environment, and natural changes in skin over time. Common contributors include:

• Harsh soaps or cleansers that strip oils and irritate the barrier

• Over-exfoliation (physical scrubs or frequent acids)

• Dry or cold weather and low-humidity indoor air

• Frequent hot showers or long bathing times

• Natural aging-related changes in barrier function

• Environmental stressors (for example, pollution)

When NMF levels are low, you may notice:

• Dryness and tightness (especially after cleansing)

• Rough texture or dullness

• Flaking

• Increased sensitivity or stinging with products

If these symptoms persist or are severe, consider consulting a dermatologist to rule out conditions such as eczema or contact dermatitis.

How Skincare Can Support Natural Moisturizing Factors

While your skin naturally forms NMF, topical skincare can help by (1) supplying humectants that bind water and (2) supporting the barrier to reduce moisture loss.

Products formulated for dry skin often include NMF-like ingredients such as urea, PCA/sodium PCA, lactate, glycerin, and hyaluronic acid.

Examples of humectants commonly used in moisturizers include:

• Glycerin

• Hyaluronic acid

• Urea

• Sodium PCA

• Lactate (or lactic acid derivatives used for hydration)

These ingredients can improve hydration by increasing water content in the stratum corneum. If you’re choosing a product, look for formulas that combine humectants with barrier-supporting ingredients (for example, occlusives and emollients) to help keep moisture from evaporating.

Example: If you use products such as Moiz XL Hydro Boost Cream or Moiz LMF 48 Lotion, check the label for humectants like glycerin, sodium PCA, urea, and hyaluronic acid. These ingredients are commonly used to support hydration in dry or tight-feeling skin.

How to Protect Your Skin’s Natural Moisturizing Factors

Protecting NMF levels is largely about gentle cleansing, avoiding unnecessary irritation, and sealing in water after washing. Dermatologists often recommend:

• Use a gentle, soap-free cleanser (especially on the face)

• Moisturize while skin is still slightly damp (within a few minutes of washing)

• Avoid over-exfoliation and limit strong actives if your barrier feels compromised

• Use sunscreen daily to reduce UV-related barrier stress

• Protect skin in harsh weather (gloves, scarves) and consider a humidifier in very dry indoor air

Over time, these habits help keep the stratum corneum hydrated and support the skin’s natural moisture-retaining mechanisms.

FAQ: Natural Moisturizing Factors (NMF)

Is NMF the same as hyaluronic acid?

No. NMF refers to a naturally occurring mixture (amino acids, PCA, urea, lactate, salts, and sugars) inside the stratum corneum. Hyaluronic acid is a single ingredient often added to skincare to help bind water.

What ingredients help support natural moisturizing factors?

Look for humectants and NMF-like components such as glycerin, urea, sodium PCA, lactate, and hyaluronic acid, plus barrier-supporting emollients/occlusives that help reduce water loss.

Why does my skin feel tight after washing?

Tightness after cleansing can happen when the cleanser is too harsh, water is too hot, or your barrier is already dry—factors that can reduce surface hydration and make low NMF-related dryness feel worse. Switching to a gentle cleanser and moisturizing right after washing often helps.

Natural Moisturizing Factors for Healthy Skin (Key Takeaway)

Natural Moisturizing Factors are essential for maintaining hydration in the stratum corneum. When NMF levels are adequate, skin tends to feel soft and comfortable. When they’re depleted, dryness, flaking, and sensitivity are more likely.

By understanding the role of natural moisturizing factors (NMF) and supporting them with gentle cleansing and well-formulated moisturizers, you can help your skin hold water more effectively and stay healthier-looking over time.