How to Make a Facial Oil Serum with Only Carrier Oils

A beginner-friendly foundation for serious formulators

Facial oil serum formulation is one of the cleanest entry points into cosmetic formulation. Not because it’s simplistic, but because it strips the process down to what actually matters: oil selection, skin feel, and fatty acid chemistry.

Facial oil serums are anhydrous systems. No water phase, no emulsifiers, no preservation hurdles. You are working with oils only, which means fewer variables and far more control. For beginners, this removes unnecessary complexity. For advanced formulators, it creates space to deepen expertise in oil behavior, oxidation stability, absorption profiles, and sensory design.

In this guide, we intentionally start with carrier oils only. Not because essential oils or oil-soluble actives lack value, but because understanding the base system first is what allows you to use those advanced materials well later on. Strong formulations are built in layers, and carrier oils are the foundation layer.

You will learn how to design a functional facial oil serum, how to choose oils based on skin type and formulation goals, and how to blend a serum that feels refined rather than greasy. Once this base is solid, expanding into more complex oil systems becomes a creative choice rather than guesswork.

Further reading:
If you want to see how professional formulators choose oils for premium products, see “The 5 Best Oils for Luxury Facial Serums (and Why Formulators Love Them)”.

What Is a Facial Oil Serum?

A facial oil serum is a concentrated, oil-based skincare product composed entirely of lipophilic ingredients. There is no water phase and no fillers. Most formulas are built from botanical carrier oils and, in more advanced systems, oil-soluble actives.

Unlike water-based serums that rely on humectants and emulsifiers, oil serums function primarily as emollient and occlusive systems. They soften the skin, reinforce the barrier, and reduce transepidermal water loss by sealing in existing moisture. This is why facial oils are typically applied as the final step of a routine, or layered after water-based products or instead of a moisturizer.

Because facial oil serums are anhydrous, they do not support microbial growth and therefore do not require traditional preservatives. Shelf life instead depends on oil stability and oxidation control, which is managed through intelligent oil selection, antioxidant use, and proper storage.

For formulators, facial oil serums are powerful because every ingredient must earn its place. Each oil contributes directly to skin feel, absorption speed, barrier support, and performance. There is nowhere to hide weak ingredient choices.

Further reading:
To understand how facial oils fit into a complete skincare routine and how they differ from creams and lotions, see “Facial Oil vs Moisturizer: What’s the Difference (and Which One Should You Start With?)”.

Why Start with Only Carrier Oils?

Working with carrier oils alone offers several advantages:

Lower risk, clearer feedback
Carrier oils are generally well tolerated when selected appropriately. By excluding fragrance materials and highly concentrated actives early on, you reduce irritation risk and gain clearer feedback on how each oil behaves on the skin.

Carrier oils are not “inactive”
High-quality carrier oils contain fatty acids, antioxidants, sterols, and vitamins that actively influence skin function. Rosehip seed oil contributes pro-vitamin A compounds, marula oil delivers antioxidant support, and oils rich in linoleic acid play a role in barrier regulation. A well-designed oil blend can be highly functional without additional actives.

Formulation clarity and stability
The more ingredients you add, the harder it becomes to diagnose instability, oxidation issues, or poor skin feel. Oil-only systems eliminate pH concerns and microbial risk entirely, allowing you to focus on oxidation management and sensory optimization.

Oil chemistry mastery
Understanding fatty acid profiles, oxidative stability, and absorption behavior is core formulation knowledge. Learning how oleic-rich and linoleic-rich oils behave on different skin types is far more valuable long-term than memorizing ingredient lists.

A foundation for advanced systems
Once you truly understand carrier oils, incorporating essential oils and oil-soluble actives becomes strategic rather than decorative. At that stage, these ingredients are added intentionally, within dermal limits, and in service of a clearly defined formulation goal.

In practice, many professional oil serums rely primarily on intelligently chosen carrier oils, with advanced ingredients used sparingly and purposefully. A strong base formula does not become obsolete when you add complexity. It becomes the structure that supports it.

Further reading:
If you’re interested in why oil-based systems are often the smartest starting point for indie brands and formulators, see “Why Starting a Skincare Brand with Oil-Based Products Makes Sense”.

Choosing the Right Carrier Oils for Your Skin

Not all carrier oils behave the same on the skin. Their fatty acid profiles, molecular weight, oxidation stability, and sensory properties differ significantly. This is exactly why formulating your own facial oil serum is so powerful. You are not choosing oils based on trends, but based on skin physiology and formulation goals.

Below are practical guidelines to help you select carrier oils based on skin type. These are not rigid rules, but proven starting points used by formulators.

Oily or Acne-Prone Skin

Acne-prone skin often benefits from oils that are lightweight, fast-absorbing, and rich in linoleic acid, a fatty acid commonly found at lower levels in acneic sebum. Oils with this profile tend to support barrier function without contributing to pore congestion.

Good choices include hemp seed oil, grapeseed oil, and rosehip seed oil. These oils absorb quickly and are commonly used in acne-focused formulations. Squalane is another excellent option. It is extremely lightweight, stable, and closely mimics the skin’s natural lipids.

Tamanu oil can be useful in small amounts due to its skin-repair properties, but it is heavier and best used as a supporting oil rather than the base. Jojoba oil also deserves mention here. Although technically a liquid wax, its structure is very similar to human sebum and it is often used to help normalize oil production.

Further reading:
For a deeper look at acne-safe oil selection, see “Facial Oils for Oily & Acne-Prone Skin: 5 Lightweight Picks That Actually Work” and “What Does Non-Comedogenic Really Mean?”.

Dry or Mature Skin

Dry and mature skin types typically benefit from oils higher in oleic acid and naturally occurring antioxidants. These oils help soften the skin, reinforce the barrier, and reduce moisture loss.

Marula oil is a strong all-rounder for this category. It offers a rich feel without being overly greasy and contains natural antioxidant compounds. Camellia seed oil, often referred to as Tsubaki oil, is another excellent option. It is silky, elegant, and traditionally used in skin and hair care for its conditioning properties.

For more intensive support, small amounts of prickly pear seed oil can be added. It is highly concentrated in antioxidants and is commonly used in mature-skin formulations. Avocado oil and argan oil are also effective choices, though they tend to be heavier and are often better suited for night serums or very dry climates.

Sensitive or Easily Irritated Skin

When working with sensitive skin, simplicity is key. Gentle, well-tolerated oils with minimal irritation potential should take priority.

Jojoba oil is often a first choice due to its excellent skin compatibility. Sweet almond oil and apricot kernel oil are also commonly used for their softening and calming properties, although almond oil should be avoided in cases of nut allergy. Oat oil, when available, is particularly valuable for sensitive skin due to its naturally soothing components.

For reactive skin, limiting the formula to one or two carrier oils can be beneficial. Fewer variables make it easier to identify potential triggers and keep the formulation predictable.

Combination or Normal Skin

Combination and normal skin types allow for more flexibility. A balanced blend that combines different oil weights usually works best.

A common structure is to use a medium-weight base oil at around 50 to 70 percent, such as jojoba, argan, or macadamia oil. This can be paired with a lighter oil like squalane or grapeseed oil, and finished with a smaller amount of a more nutrient-dense oil such as rosehip or marula.

For example, a simple balanced blend might include 60 percent jojoba oil, 30 percent rosehip seed oil, and 10 percent camellia seed oil. The result is a serum that absorbs well while still providing nourishment.

In most cases, using more than three carrier oils does not improve performance. Many effective professional formulas rely on just two or three well-chosen oils. Often, restraint produces better results than complexity.

A Note on Skin Feel and Spreadability

One of the biggest differences between a homemade oil blend and a truly refined facial oil serum is skin feel.

Carrier oils define the functional backbone of a formula, but they do not always deliver the slip, spreadability, and after-feel people associate with high-end serums. This is where formulators begin to think beyond skin type and into sensory design.

Lightweight emollients such as squalane, caprylic/capric triglyceride (CCT), and certain plant-derived esters are often used to improve spreadability, reduce greasiness, and create a more elegant finish. These materials do not replace carrier oils. They support them.

For example, a blend based entirely on nutrient-rich oils like rosehip, marula, or avocado may feel heavy or slow-absorbing on some skin types. Introducing a portion of squalane or CCT can dramatically improve glide and absorption without diluting the formula’s performance.

Plant-based esters serve a similar role. They are designed to mimic the light, dry feel of silicones while remaining biodegradable and skin-compatible. When used thoughtfully, they help transform a functional oil blend into a serum that feels smooth, fast-spreading, and cosmetically elegant.

This is not a requirement for beginners. It is a design choice. Many excellent oil serums rely solely on well-chosen carrier oils. However, once you understand oil behavior and fatty acid profiles, incorporating sensory modifiers becomes a powerful way to refine your formulations.

In practice, advanced formulators often approach oil serums in layers:

• carrier oils for skin benefits and barrier support
• lightweight emollients for slip and absorption
• oil-soluble actives for targeted performance

Learning each layer separately is what allows you to combine them successfully later.

Step-by-Step: How to Formulate Your Own Facial Oil Serum

Once you understand oil selection, the formulation process itself is refreshingly straightforward.

1. Define the Goal of the Formula

Start with a clear objective. Is the serum designed to support acne-prone skin, improve barrier comfort, enhance glow, or target signs of dryness and aging? The goal determines both oil selection and texture expectations.

2. Choose 1 to 3 Carrier Oils

Select your carrier oils based on the goal and skin type. Most formulas perform best with two or three oils. Decide on approximate ratios before you begin. Typically, one oil forms the structural base, one supports absorption or skin feel, and one adds targeted benefits.

3. Prepare Your Tools and Workspace

Work cleanly and precisely. You will need a small mixing container, a digital scale that measures in grams, pipettes or droppers, and a clean glass bottle. Dark glass bottles are preferred for storage.

4. Weigh and Combine the Oils

Place your mixing container on the scale and tare it. Add each oil slowly according to your planned percentages. Precision matters more than speed. Small deviations are usually acceptable, but accuracy improves repeatability.

5. Optional: Antioxidants and Advanced Ingredients

At this stage, a small amount of vitamin E can be added as an antioxidant, typically between 0.2 and 0.5 percent. This helps slow oxidation, especially in formulas containing more delicate oils.

Essential oils and oil-soluble actives can also be introduced later, once the base formula is well understood. When used, they should always stay within appropriate dermal limits and be added intentionally, not by default.

6. Mix Thoroughly

Gently stir or roll the container until the oils are fully combined. Oil-only systems blend easily and require no special processing.

7. Bottle and Label

Transfer the serum into a clean, airtight bottle. Label it with the formula and date. Light-protective packaging helps maintain stability over time.

8. Patch Test and Use

Always patch test before regular use. Apply a few drops to clean skin, typically as the final step of a routine to help seal in moisture.

9. Storage and Shelf Life

Store the serum in a cool, dark place. Most oil-only serums are best used within three to six months, depending on oil selection and storage conditions. Any noticeable change in smell or texture is a sign that the formula should be replaced.

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Want to Formulate Like a Pro?

If you enjoy working with facial oils and want to go beyond basic blending, structured knowledge makes a real difference.

The Oil-Based Serum Formulation Guide is designed for formulators who want to understand oil chemistry deeply and use it confidently. It covers carrier oils, fatty acid behavior, oil-soluble actives, formulation logic, and professionally designed recipes that can be adapted for personal use or product development.

If your goal is to create facial oil serums that feel intentional rather than improvised, this guide gives you the framework to do exactly that.