7 Excellent Facts You Need to Know About Ceramides
What Are Ceramides?
7 Excellent Facts You Need to Know About Ceramides
The Complete Guide to the Ingredient That Holds Your Skin Barrier Together
Key Takeaways
✔ Ceramides are lipids that make up roughly half of your skin barrier’s structure, they are what actually holds your skin cells together.
✔ Ageing, sun exposure, over-exfoliation and environmental stress can strip away more than 30% of your barrier’s natural lipid content over time.
✔ A compromised barrier shows up as sensitivity, redness, dehydration, flaking and a general loss of resilience.
✔ The most effective ceramide formulations replace lipids in the same 3:1:1 ceramide-to-cholesterol-to-fatty-acid ratio the skin naturally uses, not a random blend.
✔ Ceramides work best as a finishing step, sealing in everything applied underneath rather than competing with serums or treatments.
What Are Ceramides?
If you’ve spent any time researching skincare recently, you’ve probably noticed “skin barrier” has become one of the most talked-about topics in the industry. At the centre of that conversation is a single ingredient: ceramides.
Ceramides are a type of lipid, a fat molecule, that occurs naturally in the skin. They aren’t a trend ingredient or a recent discovery. They’ve been studied in dermatological science for decades, and they make up a significant proportion of the outermost layer of skin, known as the stratum corneum.
The easiest way to understand ceramides is through what dermatologists call the “brick and mortar” model of the skin barrier. Skin cells, called corneocytes, are the bricks. Ceramides, alongside cholesterol and fatty acids, are the mortar that holds those bricks together. Without enough mortar, the wall doesn’t hold, moisture escapes, and irritants get in.
Why Does Skin Need Ceramides?
A healthy skin barrier has one core job: keep the good things in, and keep the bad things out. Hydration, in. Irritants, allergens and pollution, out.
Ceramides are central to that job. When ceramide levels are healthy, skin tends to look and feel:
- Smoother
- More comfortable
- Better hydrated
- More resilient to everyday stress
- Calmer, with less visible redness or reactivity
As we age, and as skin is exposed to UV light, pollution and over-exfoliation, ceramide levels decline. Research shows that skin can lose more than 30% of its barrier lipid content over time due to age and environmental stress alone. That decline doesn’t happen overnight, but its effects compound, which is why supporting ceramide levels becomes more important with every year of sun exposure, active use and general wear on the skin.
What Happens When a Skin Barrier Is Compromised?
A compromised barrier rarely announces itself with a single symptom, it usually shows up as a pattern.
Tightness and flaking, especially after cleansing or in dry or cold conditions.
Redness and reactivity, where products that were once tolerated start to sting or irritate.
Dehydration, even in skin that produces plenty of oil, since oil and hydration are not the same thing.
Dullness or uneven tone, as a stressed barrier struggles to support healthy skin function.
Slower recovery, particularly after sun exposure, exfoliation or professional treatments.
This is often made worse by the very habits meant to improve skin, over-exfoliating, using multiple strong actives at once, or skipping a proper moisturising step in favour of “lighter” routines. A compromised barrier needs rebuilding, not more challenge.
How Do Ceramide Formulations Actually Repair the Barrier?
Not all ceramide products are created equal, and this is where the science gets genuinely interesting.
Dermatological research has shown that the skin barrier repairs itself most effectively when ceramides are replaced alongside cholesterol and free fatty acids, in approximately the same 3:1:1 ratio the skin uses naturally. An unbalanced mix, ceramide alone, or the wrong ratio of the three, repairs the barrier far less efficiently than a formulation that mirrors skin’s own composition.
Our Ceramide Barrier Complex is built on this principle. It contains Ceramide Complex, combining three matched ceramide types, AP, NP and NG, formulated in the same 3:1:1 ceramide, cholesterol and fatty acid ratio the skin naturally uses. Rather than sitting on the surface, this composition is designed to genuinely rebuild the barrier’s structure.
What Makes a Great Ceramide Barrier Cream?
A well-formulated barrier cream is about more than ceramide content alone. Our Ceramide Barrier Complex combines five working ingredients, each with a specific, evidence-based role:
Ceramide Complex (AP · NP · NG) to restore the barrier’s structural “mortar” in skin’s own ratio.
Niacinamide (Vitamin B3), one of the most well-studied ingredients in skincare, which helps skin produce more of its own ceramides and barrier lipids while calming redness and evening tone.
Squalane, a biomimetic lipid very similar to skin’s own natural oils, replenishing softness and elasticity while preventing dehydration.
Panthenol (Pro-Vitamin B5), which delivers long-lasting hydration while soothing irritation and supporting the skin’s own recovery process.
Centella Asiatica (CICA), rich in skin-soothing compounds that calm and comfort stressed skin while supporting natural repair.
Together, these ingredients don’t just sit alongside the ceramides, several of them actively support the same barrier-repair job from a different angle, which is a meaningfully different approach to formulation than simply adding a ceramide to an existing moisturiser base.
Who Needs Ceramides?
In truth, almost everyone. A healthy barrier is foundational to every other result skincare is trying to achieve, which is why ceramide barrier creams are formulated for all skin types.
That said, some clients benefit even more visibly:
Compromised or sensitised skin, including redness, reactivity or skin recovering from over-exfoliation or a professional treatment.
Uneven tone or dullness, where barrier stress is contributing to blotchiness or a lack of radiance.
Dehydrated or tight skin, with visible flaking or dry patches.
Anyone using active ingredients, such as retinol, acids or peptide serums, since a stronger barrier helps skin tolerate those actives more comfortably.
Anyone who simply wants a reliable, everyday cream, since a healthy barrier is the foundation every other skincare goal is built on.
Marisa’s Personal Recommendation
I always tell therapists the same thing when we talk about barrier repair: this is not the exciting part of skincare, and that’s exactly why it matters so much. Clients get drawn to serums and actives because they promise visible change, but none of those actives work as well as they could on a barrier that’s falling apart underneath them. Ceramide Barrier Complex isn’t designed to be the flashiest step in someone’s routine. It’s designed to be the reason every other step actually delivers.
— Marisa Dimitriadis, Founder, SIX Skincare
Frequently Asked Questions
Are ceramides natural, or are they synthetic ingredients?
Ceramides occur naturally in human skin. The ceramides used in skincare formulations are typically lab-created to closely match the structure of those naturally found in the skin barrier, allowing for consistent, stable and effective formulations.
Can ceramides actually repair a damaged skin barrier?
Ceramides support and rebuild the skin barrier by restoring the lipids lost through ageing, sun exposure and over-exfoliation. Formulations that mirror skin’s natural 3:1:1 ceramide, cholesterol and fatty acid ratio are shown to support barrier recovery more effectively than ceramide alone.
Do ceramides help with sensitive skin?
Yes. Because ceramides support repair rather than causing irritation, ceramide-based formulations are frequently recommended for sensitive, reactive or compromised skin.
How long does it take to see results from a ceramide cream?
Comfort and softness are often felt within the first few uses. Visible barrier resilience, meaning less tightness, fewer flare-ups and a steadier tone, generally builds over several weeks of consistent use, since this is genuine repair rather than a temporary surface effect.
Can younger skin benefit from ceramides too?
Absolutely. While barrier support becomes increasingly important with age and sun exposure, a healthy barrier benefits skin at any age, and is especially useful for anyone using active ingredients that can be more demanding on the skin.
Expert Insight by Marisa Dimitriadis
If there’s one shift I’d want every client to understand, it’s this: skincare isn’t only about what you add to your skin, it’s about what your skin is able to hold onto and use. A compromised barrier will undermine even the best serum in the world. That’s why I built Ceramide Barrier Complex around real barrier science, ceramides in skin’s own ratio, supported by niacinamide, squalane, panthenol and centella asiatica, rather than a single trend ingredient. It isn’t the most dramatic product in a routine. It’s the one that makes every other product actually work.
Build Your SIX Routine
A complete routine built around genuine barrier repair: (Products mentioned below can be purchased online at Send Me That)
| Step | Product | Why it Belongs |
| 1. Cleanse (AM & PM) | Prebiotic Gentle Wash | Removes impurities and makeup while preserving the skin’s natural moisture barrier, so the repair process isn’t undone at the very first step. |
| 2. Prepare (AM & PM) | Prebiotic Soothing Lotion | Balances and hydrates the skin, supporting the microbiome and priming skin to absorb the treatment step that follows. |
| 3. Treat (AM & PM) | Copper Peptide Serum | Supports collagen production and skin repair, working alongside a strengthened barrier for more comfortable, effective results. |
| 4. Seal (AM & PM) | Ceramide Barrier Complex ⭐ HERO PRODUCT | The finishing step. Restores the barrier’s ceramide, cholesterol and fatty acid content in skin’s own 3:1:1 ratio, locking in everything applied underneath. |
| 5. Protect (AM only) | Broad Spectrum Anti-Ageing Fluid SPF 50+ | Protects the barrier from further UV-related lipid loss, safeguarding the repair the rest of the routine is working to build. |
Continue Learning
Explore more from The SIX Skin Science Library:
- Ceramides vs Copper Peptides: Which Does Your Skin Barrier Actually Need?
- How Does Niacinamide Help Your Skin Produce More Ceramides?
- Can You Use a Ceramide Moisturiser Every Day?
- Ceramide Barrier Complex for Sensitive and Compromised Skin
- What Are Copper Peptides? Everything You Need to Know
Scientific References
- Rogers, J., Harding, C., Mayo, A., Banks, J., & Rawlings, A. (1996). Stratum corneum lipids: the effect of ageing and the seasons. Archives of Dermatological Research, 288(12), 765–770.
- Man, M.Q., Feingold, K.R., Thornfeldt, C.R., & Elias, P.M. (1996). Optimization of physiological lipid mixtures for barrier repair. Journal of Investigative Dermatology, 107(5), 694–700.
- Tanno, O., Ota, Y., Kitamura, N., Katsube, T., & Inoue, S. (2000). Nicotinamide increases biosynthesis of ceramides as well as other stratum corneum lipids to improve the epidermal permeability barrier. British Journal of Dermatology, 143(3), 524–531.
- Bissett, D.L., Oblong, J.E., & Berge, C.A. (2005). Niacinamide: A B vitamin that improves aging facial skin appearance. Dermatologic Surgery, 31(7 Pt 2), 860–865.
- American Academy of Dermatology. Understanding and Protecting Your Skin Barrier.
- National Institutes of Health. Skin Barrier Function, Structure and Repair.