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Cove Daily Barrier Cream — a daily moisturiser for eczema-prone and sensitive skin. £24. Free UK delivery over £30.
The Science Behind Ezcema Prone Skin
Eczema is not a surface problem. It is a structural failure of the skin barrier — and understanding that changes everything about how you treat it. This page explains the biology behind eczema-prone skin and the science behind how Cove is formulated to address it. Cove is a daily ceramide cream for eczema-prone skin, formulated to address that structural failure — not just moisturise over the top of it.
Why your skin barrier matters
Your skin's outermost layer — the stratum corneum — works like a brick wall. The bricks are your skin cells. The mortar between them is a precise mixture of lipids: ceramides, cholesterol and fatty acids, arranged in repeating sheets called lamellar bilayers. This structure does two critical jobs. It keeps water inside your skin, preventing the moisture loss that leads to dryness and tightening. And it keeps irritants, allergens and bacteria out. In eczema-prone skin, this mortar is compromised. Ceramide levels can be up to 50% lower than in healthy skin. The lamellar structure breaks down. Water escapes faster. Irritants get in more easily. The immune system overreacts. The result is the itch-scratch cycle that anyone with eczema knows too well. Cove is formulated to address every one of these defects — not just moisturise over the top of them.
The Skin Barrier. Your skin is a wall. Eczema means the bricks are missing.
Healthy skin has a layered structure. The outermost layer — the stratum corneum — is made up of flattened skin cells (corneocytes) held together by a lipid matrix of ceramides, cholesterol, and fatty acids. This is often described as a brick-and-mortar structure: the cells are the bricks, the lipids are the mortar.
In eczema-prone skin, this structure is compromised. Genetic mutations — particularly in the filaggrin gene — reduce the skin's ability to produce the proteins and lipids that hold the barrier together. The result is a barrier that lets water out and lets irritants, allergens, and bacteria in.
This is why eczema skin is dry, reactive, and prone to infection. It is not a sensitivity problem. It is a structural problem.
Ceramide Science. Ceramides are the mortar. Without them, the wall falls apart.
Ceramides make up approximately 50% of the lipid matrix in the stratum corneum. In eczema-prone skin, ceramide levels are significantly reduced — sometimes by as much as 40% compared to healthy skin. This depletion is not cosmetic. It directly impairs the barrier's ability to retain water and exclude irritants.
Cove's Daily Barrier Cream contains three ceramides — ceramide NP, ceramide AP, and ceramide EOP — in a ratio that mirrors the natural composition of healthy skin.
The 1:1:1 Ceramide Ratio
Research has shown that the skin's natural ceramide composition consists of a ceramide NP : ceramide AP : ceramide EOP ratio of approximately 1:1:1. This balanced ratio is essential for maintaining the skin barrier's integrity and function.
Jungersted et al., Journal of Lipid Research, 2010
The right ratio matters more than the right ingredient
Most creams that contain ceramides simply add them to a formula and call it done. The science says that isn't enough. Research by Bouwstra and colleagues showed that the lipid bilayers in healthy stratum corneum only form correctly when ceramides, cholesterol and fatty acids are present in approximately equal molar amounts — a 1:1:1 ratio. Get the ratio wrong and the lamellar structure either doesn't form or forms incorrectly, leaving the barrier disorganised and permeable. Cove uses ceramide NP — the ceramide type most abundant in human skin — alongside cholesterol and palmitic acid, the most abundant free fatty acid in healthy stratum corneum, at a precise 1:1:1 molar ratio. This isn't a marketing claim. It's the ratio the published research identifies as physiologically correct. We also include niacinamide at 2%, which has been shown to stimulate the skin's own ceramide synthesis from within — so we're supporting the barrier from two directions simultaneously.
The Itch-Scratch Cycle. Scratching makes eczema worse. Here is why.
When the skin barrier is compromised, nerve endings become sensitised and trigger itch signals more easily. Scratching provides temporary relief but causes direct mechanical damage to the barrier — releasing inflammatory cytokines, disrupting the lipid matrix further, and creating micro-tears that allow bacteria to enter.
This triggers more inflammation, which triggers more itch. The cycle is self-reinforcing and difficult to break without addressing the underlying barrier deficit.
Cove is formulated to interrupt this cycle at the structural level — by restoring the lipid matrix, reducing transepidermal water loss, and calming the inflammatory response that drives itch.
Inflammation. Calming the response without suppressing the skin.
Chronic inflammation in eczema is driven by an overactive immune response to barrier breach. Cove addresses this with four evidence-based actives, each working through a distinct mechanism.
Colloidal Oatmeal — 1% active
Colloidal oatmeal contains avenanthramides — polyphenolic compounds that inhibit the release of pro-inflammatory cytokines including IL-4 and IL-13. It also forms a physical film on the skin surface that reduces transepidermal water loss. Recognised as a skin protectant by the FDA at concentrations of 0.5–2%.
Niacinamide — 4% active
Niacinamide (vitamin B3) reduces the production of inflammatory mediators, inhibits the transfer of melanosomes to keratinocytes, and supports ceramide synthesis in the skin. At 4%, it has been shown to reduce skin redness and improve barrier function in eczema-prone skin.
Allantoin — 0.5% active
Allantoin promotes keratinocyte proliferation and accelerates the skin's natural repair process. It has a soothing effect on irritated skin and is included in Cove to support recovery from barrier disruption and scratching damage.
Rosehip CO2 Extract — 0.5% active
Rosehip CO2 extract is rich in linoleic acid — an omega-6 fatty acid that is a direct precursor to ceramide synthesis. Eczema-prone skin is often deficient in linoleic acid. Supplementing it topically supports the skin's ability to rebuild its own lipid matrix.
Skin pH is not a detail. It is a control system.
The skin's acid mantle — a thin film on the surface — maintains a pH of 4.5 to 5.5 in healthy skin. This slightly acidic environment is critical for two reasons: it activates the enzymes that organise lipids into functional barrier structures, and it inhibits the growth of Staphylococcus aureus — the bacteria that colonises eczema skin and drives flares.
In eczema-prone skin, surface pH is consistently elevated — often 6.0 to 7.0. At this pH, barrier-organising enzymes are impaired and S. aureus thrives. Cove is pH adjusted to 5.0 to 5.5 to support the acid mantle and create an environment hostile to S. aureus colonisation.
Three humectants. Three mechanisms.
Most moisturisers use one humectant — usually glycerin — at a single concentration. Cove uses three, each working differently and at a different depth in the skin. Glycerin at 3% draws water to the skin surface through osmosis and fills the spaces between skin cells, physically reducing the pathways through which water can escape. Sodium PCA at 1% active is a component of the skin's own natural moisturising factor — the water-binding system naturally found inside skin cells. In eczema-prone skin this system is often impaired due to filaggrin gene mutations. Sodium PCA is 1.5 times more effective at water binding than glycerin, molecule for molecule. Panthenol at 2% works at a metabolic level. Once on skin it converts to pantothenic acid, a cofactor essential for the skin's own fatty acid synthesis. It also has demonstrated anti-inflammatory and barrier repair activity independently of its humectant properties.
Common questions
Is niacinamide good for eczema?
Yes. Niacinamide at 4% has been shown to reduce inflammatory markers, support ceramide synthesis, and improve skin barrier function in eczema-prone skin. It also reduces redness and helps even skin tone over time. Cove contains niacinamide at 4% active.
What does colloidal oatmeal do for eczema-prone skin?
Colloidal oatmeal contains avenanthramides — anti-inflammatory compounds that inhibit cytokine release and reduce itch. It also forms a protective film on the skin surface that reduces water loss. It is recognised as a skin protectant by the FDA at concentrations of 0.5–2%. Cove contains colloidal oatmeal at 1% active.
Why does skin pH matter for eczema?
Healthy skin has a surface pH of 4.5 to 5.5. Eczema skin is consistently more alkaline — often 6.0 to 7.0. At the wrong pH, the enzymes that organise skin lipids into functional barrier structures don't work properly. Staphylococcus aureus, the bacteria that colonises eczema skin, thrives at pH 6.0 to 7.0 but is significantly inhibited at pH 5.0 to 5.5. Cove is pH adjusted to 5.0 to 5.5.
What is the difference between a moisturiser and a barrier cream for eczema?
A standard moisturiser adds water or occludes the surface temporarily. A barrier cream is formulated to structurally repair the lipid layer between skin cells — replacing the ceramides, cholesterol and fatty acids that are depleted in eczema-prone skin. Cove is formulated as a barrier cream, not a moisturiser.
Collapsible content
What humectants are in Cove Daily Barrier Cream?
Cove uses three humectants working at different depths: glycerin at 3% draws water to the skin surface; sodium PCA at 1% active replaces a component of the skin's natural moisturising factor often impaired by filaggrin gene mutations; and panthenol at 2% converts to pantothenic acid on the skin, supporting fatty acid synthesis and barrier repair.
Is Cove Daily Barrier Cream safe for children?
Yes. Cove is suitable for adults and children, including babies with eczema-prone skin. The formula contains no fragrance, no essential oils, and no known irritants
Calming the response, not just covering it up
Barrier repair alone isn't enough if inflammation continues unchecked. Cove contains four actives that target inflammation through different mechanisms. Colloidal oatmeal at 2% contains avenanthramides — compounds unique to oats that directly inhibit a key inflammatory signalling molecule, reducing pro-inflammatory cytokine production and histamine-triggered itch signalling. We use it at 2% — double the minimum concentration used in clinical studies. Niacinamide suppresses immune cell activation in response to allergens and reduces pro-inflammatory cytokine release — working on the immune side of eczema as well as the barrier side. Allantoin at 0.2% promotes the skin cell renewal needed to rebuild damaged tissue and has direct anti-irritant activity. Rosehip CO2 extract at 0.5% provides antioxidants that neutralise the oxidative stress elevated in eczema skin and protect the polyunsaturated fatty acids essential to barrier function.
pH — a detail most creams ignore
Healthy skin has a surface pH of 4.5 to 5.5. Eczema skin consistently shows higher pH — often 6.0 to 7.0. At the wrong pH, the enzymes that organise your skin's lipids into functional lamellar bilayers don't work properly. Staphylococcus aureus — the bacteria that colonises eczema skin and drives the inflammatory cycle — thrives at pH 6.0 to 7.0 but is significantly inhibited at pH 5.0 to 5.5. Beneficial protective bacteria prefer the lower, correct pH. Cove is pH adjusted to 5.0 to 5.5 using lactic acid — itself a natural component of the skin's own moisturising factor. At the concentration used it has no exfoliating effect. It is there purely to return the skin surface to its correct acidic environment.