What are Ceramides: Benefits, Skin Barrier & How They Work
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If your skin feels tight, irritated, flaky or suddenly more sensitive than usual, a damaged skin barrier may be the reason.
So, what are ceramides? Ceramides are one of the most important ingredients for restoring and protecting the skin barrier.
People often focus on active ingredients such as vitamin C, retinol and exfoliating acids, while overlooking the foundation of healthy skin: the barrier itself.
Ceramides are naturally found within the skin and play a crucial role in keeping it hydrated, resilient and comfortable. When ceramide levels decline, the skin becomes more vulnerable to dryness, irritation and premature ageing.
In this guide, I’ll explain what ceramides are, how they work and why they deserve a place in almost every skincare routine.
What Are Ceramides?
The skin barrier is permeable, allowing irritants from the environment to pass through. Ceramides are naturally occurring lipids (fats) found within the outermost layer of the skin (stratum corneum)
Think of your skin barrier as a brick wall:
- Skin cells are the bricks
- Ceramides act as the mortar holding the bricks (skin cells) together
In fact, ceramides make up approximately 50% of the skin barrier’s lipid composition. With cholesterol and fatty acids, the barrier locks in moisture and protects from environmental stressors.
Their job is simple but essential:
- Prevent moisture loss
- Protect against environmental irritants
- Maintain skin resilience
- Support healthy skin function
Without enough ceramides, the skin barrier becomes compromised, allowing water to escape and irritants to enter more easily. This can lead to skin becoming dry, cracked, and irritated, and those with conditions like eczema and psoriasis may find their condition.
Ceramides can be natural or synthetic. Natural ceramides are plant or animal-derived; synthetic ceramides imitate natural ceramides and can be added to skincare products. All modern skincare use synthetic ceramides. These products recharge the skin barrier with ceramides, giving the skin better protection.
To learn more about products containing ceramides, read this.
Who Should Use Ceramides
Everyone can and should include ceramides in their routine. They are, however, of particular benefit to those who are likely to suffer from a damaged skin barrier, this can include but is not limited to:
- Dry or dehydrated skin
- Sensitive or irritated skin
- Anyone using potent skincare actives such as AHAs, BHAs, or retinoids
- Eczema or Psoriasis
- Acne-prone skin
- Aging Skin
Over time, several factors can reduce the skin’s natural ceramide levels, making them essential in skincare:
1. Ageing
Natural ceramide production decreases as we age; it decreases by up to 40% by your 30s and up to 60% by your 40s. This reduction changes the structural integrity of the skin barrier, contributing to dryness, fine lines and loss of elasticity.
2. Over-Exfoliation
Excessive use of exfoliating acids, harsh scrubs, or retinoids can weaken the skin barrier by stripping the skin’s top layer and depleting it of essential lipids, which are primarily ceramides. The skin becomes red, inflamed, stinging and itchy.
3. Environmental Damage
Environmental stressors can cause the lipids in the skin barrier to break down, reducing ceramide levels. UV exposure from the sun can degrade lipids; pollution can cause oxidative stress, preventing ceramide production; harsh climates can strip the skin of its natural moisture, further depleting the skin of its lipid reserves.
4. Skin Conditions
People with inflammatory skin conditions such as eczema, rosacea and chronic sensitivity often have naturally lower ceramide levels. Inflammation lowers ceramide production but also enables the breakdown of existing ceramides and lipids. Once the barrier breaks down, moisture loss further fuels the inflammation, causing a compounding cycle.
How Do Ceramides Work?
Ceramides are lipids that make up half of the skin barrier; they are the ‘mortar’ holding our cells together. Ceramides have a unique structure, creating dense water-repelling structures. Along with cholesterol and fatty acids, ceramides pack together to form a water-impermeable lipid bilayer. This matrix prevents water loss, keeping the skin hydrated; it acts as a shield against water-soluble irritants and microbes.
Ceramides are also part of the biological process regulating cell processes, including cell growth and death.
The Benefits of Using Ceramides
1. Strengthen the Skin Barrier
Ceramides help restore the protective layer that shields the skin from environmental stressors. The structure of ceramides helps them form a cohesive, thick layer, creating an impermeable barrier, blocking germ-causing irritants and environmental pollutants.
A healthy barrier means healthier, calmer and hydrated skin.
2. Reduce Water Loss
Ceramides fill in the gaps in the epidermal barrier, creating a shield that helps minimise transepidermal water loss (TEWL), allowing the skin to retain moisture more effectively. This prevents the water found in the deepest layers of the skin from evaporating into the air.
The ceramide molecules structure themselves to bind and retain water within the lipid layer. This leaves the skin feeling softer, smoother and more comfortable.
3. Soothe Sensitive Skin
When the barrier is compromised, irritation increases. Individuals with sensitive skin can benefit from using ceramides to repair their damaged skin barrier. This in-turn soothes inflammation and prevents redness and irritation.
Ceramides can help restore balance and reduce feelings of tightness, stinging and discomfort. Ceramide moisturisers can be layered with active ingredients; they can be applied to the skin before applying actives, helping the skin tolerate the actives better.
4. Support Skin Recovery
The skin barrier may become compromised after:
- Retinol use
- Chemical peels
- Over-exfoliation
- Sun exposure
- Seasonal dryness
A compromised skin barrier can cause damaged skin. Ceramides are essential for skin recovery; they prevent water loss by restoring the skin’s natural lipids, fortify the barrier and soothe irritation.
To achieve better recovery, we can pair other barrier-supporting ingredients with ceramides. These can include hyaluronic acid, niacinamide, fatty acids and cholesterol.
5. Help Prevent Premature Ageing
As we get older, everyday UV radiation exposure from the sun will reduce ceramide levels. This reduction compromises the skin barrier, causing premature ageing.
Ceramides are not an anti-ageing ingredient in the same way as retinol; however, they create the conditions needed for skin to function optimally.
By restoring the skin’s barrier, it protects against environmental stressors, keeps the skin hydrated, plumps fine lines, and promotes long-term skin resilience.
Who Should Use Ceramides?
Ceramides are suitable for almost every skin type. They are becoming more popular now, due to people overusing active ingredients and over-exfoliating, causing skin sensitivity and dehydration.
Ceramides heal the skin barrier, restoring balance and hydration.
Some of the skin conditions that can benefit from the use of ceramides include:
- Dry skin
- Sensitive skin
- Mature skin
- Rosacea-prone skin
- Eczema-prone skin
- Combination skin
- Acne-prone skin using actives
They are particularly beneficial if your skin feels compromised or dehydrated. Use products containing ceramides alongside emollients, humectants and occlusives to help with dry skin and prevent moisture loss.
How to Use Ceramides in Your Routine
When using products containing ceramides, apply to damp skin to allow them to be moisturised into the skin. For best results, apply your ceramide cream minutes after washing your face. Ceramide products can be applied after water-based serums and before SPF during the day.
What are ceramides most commonly found in? Ceramides are popularly found in:
- Day moisturisers
- Serums with other actives
- Overnight treatments
- Barrier repair creams
Potential Side Effects
Topical ceramides are naturally-occurring lipids found in the skin. They are generally safe and well-tolerated by all skin types.
While ceramides may not cause any side effects themselves, they can be formulated with other ingredients that can cause the following reactions:
- Greasy Skin – Ceramides are generally formulated into rich creams or balms, which can be too heavy for oily skin types, causing the skin to look greasy
- Breakouts – Ceramides are a non-comedogenic ingredient. For acne-prone skin, the heavier formulation may contain ingredients that can clog pores, which may cause breakouts
- Irritation – the most sensitive skin may experience some redness or slight stinging when initially applied; this should subside quickly
- Allergic Reactions – Cosmetic formulation can contain fragrances, preservatives and botanical extracts that can cause an allergic reaction
If you have sensitive skin or suffer from allergies, read the ingredient list to determine whether the formula is right for your individual needs. If in doubt, do a 48-hour patch test to determine product suitability.
Ceramides vs Other Ingredients
Ceramides pair exceptionally well with other ingredients.
Comparing ceramides to other ingredients highlights how they function:
Ceramides vs. Hydrating Agents (Glycerin, Hyaluronic Acid)
- Ceramides: Form an occlusive lipid layer, creating a seal to stop water from evaporating.
- Hydrating Agent: Are humectants, drawing in water from the environment into the skin.
- The Synergy: They work together, creating a hydrated and plump complexion.
Ceramides vs. Exfoliants & Actives (Retinol, Niacinamide, Vitamin C, AHAs/BHAs)
- Ceramides: Regenerates the skin
- Actives: Accelerates cell turnover and stimulates collagen production.
- The Synergy: When ceramides are used with harsh actives, they prevent barrier damage that leads to irritation and skin dryness.
Ceramides vs. Structural Builders (Peptides)
- Ceramides: Protect the top layer of the skin
- Peptides: Are the building blocks for proteins
- The Synergy: Accelerate barrier recovery, which soothes inflammation.
The best results often come from using various high-quality ingredients within your skin routine.
Many ceramide-containing moisturisers include multiple key ingredients that can work in synergy with the ceramides to eliminate the need for more products.
Best Products Containing Ceramides
There is no single product containing ceramides which can be considered to be the best. It is best to understand your own skin and read the ingredients list to see if the formula suits you.
What you need to look for are fatty acids and cholesterol, along with ceramides, to help with barrier repair. To address other issues, look for other ingredients such as niacinamide and hyaluronic acid.
Ceramide moisturisers tend to be richer creams with a balmy texture. If you have oilier skin, look for lighter moisturisers or apply them less frequently to suit your needs.
If you are interested in reading about some handpicked products containing ceramides, you can read our post about it here.
FAQs
What are the main benefits of using ceramides?
The main benefits of using ceramides are that they strengthen the skin barrier, locking in moisture and protecting against environmental stressors. The ceramides are anti-ageing and soothe irritation.
My skin is oily. Should I still use ceramides?
Yes, oily skin indicates that the skin is not properly hydrated. Causing the skin to overproduce sebum, making the skin oily. Ceramides do not clog pores, but balance the skin barrier.
What is the difference between natural and synthetic ceramides?
Natural ceramides are by-products of animals or derived from plants. These are unstable in cosmetic formulations. Synthetic ceramides are created in a lab, these include ceramides NP, AP or EOP and form highly stable skincare formulations.
What makes an effective ceramide formulation?
How can ceramides benefit men?
All the benefits discussed in this article are for both men and women; however, men can further benefit from using a ceramide-rich moisturiser. Daily shaving can strip the skin of its natural oils, causing skin irritation. Ceramides restore the barrier, reducing redness and razor sensitivity after shaving.
Final Verdict
With a background in chemistry, I’ve always been fascinated by the science behind skincare.
While ingredients such as retinol, vitamin C and exfoliating acids often get the most attention, they can only perform well when the skin barrier is functioning properly.
So what are ceramides? Ceramides are one of the most important components of that barrier. They help maintain hydration, improve resilience and support overall skin health.
If your skin feels dry, irritated or compromised, introducing ceramides into your routine is often one of the simplest and most effective steps you can take.
To summarise:
- What are ceramides? Ceramides are lipids and are naturally occurring fat molecules
- Primary job: Strengthens the skin barrier, sealing hydration to prevent water loss
- Benefits: Prevents dryness, irritation and skin sensitivity when used long term
- Best for: Restores damaged barriers, suitable for dry and mature skin, or eczema-prone skin
