PoreWise
中文

Skin concern

Barrier damage

Primary source

Barrier damage: the stratum corneum losing its ability to hold water in and keep irritants out. It appears as tightness, stinging and flaking. The strongest evidence comes from a 2008 review article covering humans in the cited studies, plus animal and in-vitro work on mechanism: Topical glycerol improves stratum corneum hydration, barrier function and skin mechanical properties. The review also reports reduced irritation response and faster wound healing, and traces the effect to aquaporin-3 transport and to glycerol's own presence in the skin. 4 ingredients have evidence for Barrier damage: Glycerin, Niacinamide, Panthenol, Dimethicone. 1 of the 5 findings concerns a risk.

Barrier damage raises transepidermal water loss. Five findings measure TEWL and stratum corneum hydration, including 2005 · 50 people · PMID 16209160 and 2025 · 60 people · PMID 40613435.

Where the definition comes from

Source wording

“The physical barrier is mainly localized in the stratum corneum (SC) and consists of protein-enriched cells (corneocytes with cornified envelope and cytoskeletal elements, as well as corneodesmosomes) and lipid-enriched intercellular domains.” … “Changes in epidermal differentiation and lipid composition lead to a disturbed skin barrier, which allows the entry of environmental allergens, immunological reaction and inflammation.” — from the 2008 Experimental Dermatology review.

The skin: an indispensable barrier Experimental Dermatology (Proksch, Brandner & Jensen)

Ingredients at a glance

2008 · Humans in the cited studies, plus animal and in-vitro work on mechanism · PMID 18510666

Ingredient Measured outcome Based on Certainty Year
Glycerin Skin effect Review article Moderate 2008
Niacinamide Skin effect Human trial Low 2005
Panthenol Skin effect Human trial Low 2025
Panthenol Sensitization Review article Low 2026
Dimethicone Legal limits Official legal text High 1993

Studies and results

  1. 1 Glycerin Skin effect
    Glycerol and the skin: holistic approach to its origin and functions

    Topical glycerol improves stratum corneum hydration, barrier function and skin mechanical properties. The review also reports reduced irritation response and faster wound healing, and traces the effect to aquaporin-3 transport and to glycerol's own presence in the skin.

    Review article · 2008 · Humans in the cited studies, plus animal and in-vitro work on mechanism · Leave-on products. The review discusses both healthy skin and skin with dry or barrier-impaired conditions such as atopic dermatitis. · A narrative review. It compiles mechanisms and results from other studies.

    PMID 18510666

    Read the full finding →
    Source:Glycerol and the skin: holistic approach to its origin and functions
  2. 2 Niacinamide Skin effect
    Niacinamide-containing facial moisturizer improves skin barrier and benefits subjects with rosacea

    A facial moisturiser containing niacinamide improved stratum corneum barrier function and skin hydration, measured instrumentally, in people with rosacea over four weeks of twice-daily use.

    Human trial · 2005 · 50 people · Adults with rosacea · A leave-on facial moisturiser, applied twice daily for four weeks, in adults with rosacea. · The tested article was a finished moisturiser. Fifty participants, one centre, four weeks. The study measured barrier function and hydration.

    PMID 16209160

    Read the full finding →
    Source:Niacinamide-containing facial moisturizer improves skin barrier and benefits subjects with rosacea
  3. 3 Panthenol Skin effect
    Evaluation of the Efficacy and Safety of a Panthenol-Enriched Mask for Skin Barrier Recovery After Facial Laser Treatment: Results of a Double-Blind Randomized Controlled Study

    After facial non-ablative fractional laser treatment, a panthenol mask lowered the erythema and pigmentation indices on days 3, 7 and 14 against a saline dressing, raised stratum corneum moisture, and reduced transepidermal water loss over the same days. Sebum content was also higher in the mask group on days 7 and 14.

    Human trial · 2025 · 60 people · Adults recovering from facial non-ablative fractional laser treatment · Skin recovering from 1550 nm and 1927 nm non-ablative fractional laser on the face. Both groups received standard post-procedure care. · The mask also contained madecassoside and bisabolol. It is one trial of 60 people, all recovering from the same procedure, and the published grant list includes L'Oreal Dermatological Beauty China (La Roche-Posay).

    PMID 40613435

    Read the full finding →
    Source:Evaluation of the Efficacy and Safety of a Panthenol-Enriched Mask for Skin Barrier Recovery After Facial Laser Treatment: Results of a Double-Blind Randomized Controlled Study
  4. 4 Dimethicone Legal limits
    21 CFR 347.10 - Skin protectant active ingredients (US Code of Federal Regulations)

    US regulation lists dimethicone as a permitted active ingredient in over-the-counter skin protectant products, at 1 to 30 percent. That is a legal status in one market, and it puts dimethicone in the same list as petrolatum, glycerin and colloidal oatmeal.

    Official legal text · 1993 · Consumers of over-the-counter skin protectant products in the US · Products sold in the US that make a skin-protectant claim, with dimethicone between 1 and 30 percent. · A monograph entry sets what may be sold and what may be claimed. · 1993 · Consumers of over-the-counter skin protectant products in the US.

    Read the source

    Read the full finding →
    Source:21 CFR 347.10 - Skin protectant active ingredients (US Code of Federal Regulations)

Risks found for this concern

  1. 1 Panthenol Sensitization
    Pantothenic Acid as an Unexpected Cause of Hypersensitivity to Sensitive or Atopic Skin Care Products - A Narrative Review

    Panthenol is treated as non-allergenic, this review argues that frequent exposure, especially on damaged skin, can produce hypersensitivity to it. The likely route is a delayed (type IV) contact reaction; immediate and mixed reactions remain possible. Proposes patch testing with the patient's own product and with panthenol 5% in petrolatum.

    Review article · 2026 · People with atopic or damaged skin using panthenol-containing products · People who use panthenol products repeatedly, particularly those with atopic or damaged skin - the group the author says is most exposed. · A single-author narrative review. The mechanism it proposes is stated as likely. Read it as a reason to keep panthenol on the list of possible allergens.

    PMID 42514853

    Read the full finding →
    Source:Pantothenic Acid as an Unexpected Cause of Hypersensitivity to Sensitive or Atopic Skin Care Products - A Narrative Review

Study limits

Study conditions and measured outcomes.

  • Glycerin Review article · 2008

    A narrative review. It compiles mechanisms and results from other studies.

  • Niacinamide Human trial · 2005

    The tested article was a finished moisturiser. Fifty participants, one centre, four weeks. The study measured barrier function and hydration.

  • Panthenol Human trial · 2025

    The mask also contained madecassoside and bisabolol. It is one trial of 60 people, all recovering from the same procedure, and the published grant list includes L'Oreal Dermatological Beauty China (La Roche-Posay).

  • Panthenol Review article · 2026

    A single-author narrative review. The mechanism it proposes is stated as likely. Read it as a reason to keep panthenol on the list of possible allergens.

  • Dimethicone Official legal text · 1993

    A monograph entry sets what may be sold and what may be claimed. · 1993 · Consumers of over-the-counter skin protectant products in the US.

Products with a basis for this

66 products · 10% Niacinamide Booster · Alpha Arbutin Serum 2% · 2008 · Humans in the cited studies, plus animal and in-vitro work on mechanism · PMID 18510666

Common questions

Which ingredients have been studied for Barrier damage?
Ingredients with evidence for Barrier damage: Glycerin, Niacinamide, Panthenol, Dimethicone.
How many people were studied?
5 findings · 2008 · Humans in the cited studies, plus animal and in-vitro work on mechanism · PMID 18510666
What can I use for Barrier damage?
Glycerin, Niacinamide, Panthenol · 2008 · Humans in the cited studies, plus animal and in-vitro work on mechanism · PMID 18510666
Can I use these every day for Barrier damage?
A leave-on facial moisturiser, applied twice daily for four weeks, in adults with rosacea（2005 · 50 participants · Adults with rosacea · PMID 16209160）

Other concerns

Acne marks and scars Acne and breakouts Blackheads Bumps and rough texture Closed comedones Combination skin Dark circles Dark spots Skincare for deeper skin tones Dehydrated skin Dryness Dull skin Eczema and atopic dermatitis Hyperpigmentation Large pores Loss of firmness Melasma Skincare for men Oily skin Skincare while on acne medication Peeling and flaking Perioral dermatitis Skincare during pregnancy Psoriasis Facial redness Rosacea Sebaceous filaments Sensitive skin Sun damage Sun protection Teenage skin Uneven skin tone Wrinkles and fine lines