One of the most common skincare questions is:
“If I’m already using a good serum, do I really need a moisturiser?”
For many people, the answer is yes but the reason is that serums and moisturisers serve different purposes.
Although both are designed to improve the way your skin looks and feels, they are formulated to perform different roles within a skincare routine. Understanding those roles can help you build a routine that is effective without becoming unnecessarily complicated.
What Is a Serum?
A serum is typically a lightweight skincare product formulated with a concentrated selection of ingredients designed to address specific skin concerns.
Depending on its formulation, a serum may help target:
- Dehydration
- Fine lines and wrinkles
- Uneven-looking skin tone
- Dullness
- The appearance of pigmentation
- Loss of firmness
- Blemishes
- Uneven skin texture
The key is to look at the ingredients and formulation, rather than simply choosing a serum because it is marketed as a “must-have.”
Common Serum Ingredients
Hyaluronic Acid
A humectant that helps attract and hold water in the skin, supporting a more hydrated and comfortable appearance.
Vitamin C
An antioxidant commonly used to help protect skin from oxidative stress and improve the appearance of uneven skin tone.
Niacinamide
A form of vitamin B3 that can support the skin barrier and help improve the appearance of uneven tone, pores, and excess oil.
Peptides
Ingredients commonly included in formulations designed to support smoother and firmer-looking skin.
Retinoids
Vitamin A derivatives that can help improve the appearance of fine lines, uneven texture, and other visible signs of photoaging over time.
So, in simple terms:
Serum = targeted skincare.
What Does a Moisturiser Do?
A moisturiser has a broader role. It helps maintain skin hydration and supports the skin's protective barrier.
A well-formulated moisturiser may contain three main types of ingredients:
Humectants
These attract water to the outer layers of the skin.
Examples include:
- Glycerin
- Hyaluronic acid
- Urea
Emollients
These help soften and smooth the skin by filling spaces between skin cells.
Examples include:
- Squalane
- Fatty acids
- Certain plant oils and lipids
Occlusives
These form a protective layer that helps reduce water loss from the skin.
The exact balance of these ingredients varies between products, which is why some moisturisers feel lightweight while others are richer and more nourishing.
In simple terms:
Moisturiser = hydrate + support the skin barrier.
Serum vs. Moisturiser: What's the Difference?
The easiest way to understand the difference is to think about their primary functions.
| Serum | Moisturiser |
|---|---|
| Usually focuses on specific skin concerns | Focuses on hydration and barrier support |
| Often contains targeted active ingredients | Often contains humectants, emollients and/or occlusives |
| Usually lightweight | Can range from lightweight to rich |
| Selected according to your skin concerns | Selected according to your skin type and hydration needs |
This doesn't mean every serum or moisturiser follows exactly the same formula. Some serums are highly moisturising, while some moisturisers contain powerful active ingredients.
The formulation matters more than the product category alone.
Why Use Both?
Consider a hydrating serum containing a humectant such as hyaluronic acid.
The serum can help increase hydration in the outer layers of the skin. Applying a moisturiser afterwards can provide additional emollient and/or occlusive support, helping maintain comfortable, hydrated skin.
This is why using both products can make sense when your skin benefits from targeted treatment and additional moisturisation.
However, using both isn't automatically necessary for everyone.
Your routine should depend on your skin's needs and the products you are already using.
Can You Skip Moisturiser?
Sometimes.
For example, someone with oily skin may prefer a lightweight hydrating serum followed by sunscreen that already provides sufficient moisturising benefits during the day.
On the other hand, someone with dry or easily irritated skin may prefer a dedicated moisturiser to provide additional hydration and barrier support.
The goal isn't to use as many products as possible.
The goal is to use the products your skin actually needs.
Can You Use Too Many Serums?
Yes.
More active ingredients do not necessarily mean better results.
Layering several treatment serums particularly products containing exfoliating acids, retinoids, or other potent actives can increase the likelihood of dryness, irritation, or sensitivity.
A simpler routine that you can use consistently may be more practical than a complicated routine containing numerous overlapping products.
When introducing a new active ingredient, consider starting gradually and follow the product's directions.
What Order Should You Apply Them?
A straightforward skincare routine can look like this:
Morning
Cleanse → Serum → Moisturiser → Sunscreen
If your sunscreen is sufficiently moisturising for your skin, you may not need a separate moisturiser every morning.
Evening
Cleanse → Treatment/Serum → Moisturiser
If you're using a specific treatment such as a retinoid or exfoliating acid, follow the product instructions and introduce it gradually if necessary.
And remember: sunscreen is an important part of a daytime skincare routine, particularly when you're using products designed to address pigmentation, uneven tone, or visible signs of photoaging.
What About Facial Oils?
Facial oils are another category that can sometimes cause confusion.
An oil isn't necessarily a replacement for every serum or moisturiser. Depending on its formulation, a facial oil can primarily provide emollient benefits and help soften the skin.
If you use one, it can generally be incorporated after your moisturiser or according to the product's instructions.
Again, the correct approach depends on the particular formulation and your skin's needs.
Do You Need a 10-Step Skincare Routine?
Not necessarily.
A basic routine can be surprisingly simple:
Morning:
Cleanser → Treatment/Serum → Moisturiser → SPF
Evening:
Cleanser → Treatment/Serum → Moisturiser
Additional products can be introduced when there is a specific reason to use them.
Your skincare routine should be based on your skin type, skin concerns, tolerance, lifestyle, and the formulations you're using not simply on the number of products you see recommended online.
The Bottom Line
Think of your skincare routine as a team:
SERUM = TARGET
Addresses specific skin concerns with targeted ingredients.
MOISTURISER = HYDRATE + SUPPORT
Helps maintain hydration and support the skin barrier.
SPF = PROTECT
Helps protect skin from UV radiation and is an essential part of daytime skincare.
Serums and moisturisers aren't competing products. They can complement each other when used appropriately.
And remember, more expensive doesn't automatically mean more effective. What matters is choosing well formulated products with ingredients that suit your skin and using them consistently.
Healthy looking skin isn't about having the longest skincare routine or following every new trend.
It's about understanding your skin, choosing products with purpose, and keeping your routine consistent.
✨ Know Your Skin. Choose With Purpose. Keep It Simple.
FD Beauty Studio DS
Beauty • Skin • Wellness
💬 Not sure what your skin actually needs?
Before buying another product because it's trending online, take a moment to understand your skin and what you're trying to achieve.
Message “SKIN” to start a conversation about creating a simple, practical skincare routine that works for you.