How to Make a Hair Oil Formula for Beginners: Oils, Percentages & Testing
What Is a Hair Oil Formula?
A hair oil formula is a blend of oils and other oil-soluble ingredients designed to support the look, feel, and manageability of the hair and scalp.
Hair oils can be made for different goals, such as:
- Adding shine
- Softening dry-feeling hair
- Reducing the appearance of frizz
- Supporting scalp care routines
- Sealing in moisture
- Improving slip
- Creating a lightweight finishing oil
The best formula depends on what you want the product to do and how heavy or light you want it to feel.
What Oils Can You Use in a Hair Oil Formula?
Common oils used in hair products include:
- Jojoba oil
- Argan oil
- Grapeseed oil
- Sweet almond oil
- Sunflower oil
- Avocado oil
- Castor oil
- Fractionated coconut oil
- Meadowfoam seed oil
Each oil can feel different on the hair.
Some feel very lightweight.
Others feel richer, thicker, or more coating.
That means ingredient choice matters just as much as the total amount of oil.
How Do You Choose Oils for a Hair Oil?
Start with the goal of the product.
Ask yourself whether you want the hair oil to be:
- Lightweight
- Rich
- Glossy
- Fast absorbing
- Scalp focused
- Designed for curls
- Designed for ends
- Suitable as a finishing oil
A lightweight finishing oil may use different ingredients than a heavier scalp or pre-shampoo oil.
The key is to choose ingredients intentionally instead of mixing several oils just because they are popular.
Why Should Hair Oil Formulas Be Written in Percentages?
Percentages make your formula easier to understand, adjust, and scale.
Each ingredient is assigned a percentage, and the full formula should total 100%.
For example:
- Oil A: 50%
- Oil B: 30%
- Oil C: 18%
- Additional oil-soluble ingredients: 2%
Total: 100%
This is only an example of how a formula can be structured.
How Do You Calculate Hair Oil Ingredient Weights?
Use:
Ingredient percentage ÷ 100 × total batch size = ingredient weight
For example, if an oil makes up 25% of a 100-gram formula:
25 ÷ 100 × 100 = 25 grams
For a 500-gram batch:
25 ÷ 100 × 500 = 125 grams
This allows you to keep the same formula while making different batch sizes.
Why Does My Hair Oil Feel Too Heavy?
A hair oil may feel too heavy if the formula contains too much of a thick or slow-spreading oil.
You may notice:
- Hair looks greasy
- Hair feels weighed down
- Product sits on the surface
- Fine hair loses volume
- Too much oil is needed to spread evenly
To troubleshoot, try changing one variable at a time.
You may experiment with:
- Reducing heavier oils
- Increasing lighter-feeling oils
- Adjusting the overall blend
- Testing a smaller amount during application
Document each version so you know what actually improved the feel.
Why Does My Hair Oil Feel Too Light?
Sometimes a hair oil can feel so lightweight that it does not give the finish you wanted.
If the product lacks richness, you may experiment with increasing oils that provide more body or a more noticeable coating feel.
The goal is not always to make the formula heavier.
The goal is to match the texture to the intended use.
What Is the Difference Between a Scalp Oil and a Hair Oil?
A scalp oil and a hair oil can overlap, but they may be formulated with different priorities.
A scalp oil may focus more on ease of application, spreadability, and how the product feels directly on the scalp.
A finishing hair oil may focus more on:
- Shine
- Smoothness
- Slip
- Frizz control
- Lightweight feel
A product meant for the ends of the hair may also need a different texture than one designed for full-scalp use.
Defining the use case before choosing ingredients can make formulation easier.
Can You Add Essential Oils to Hair Oil?
Essential oils may be used in some hair oil formulas, but they are highly concentrated and should not be added casually.
Always review supplier guidance and appropriate usage recommendations.
Do not assume that because an ingredient is natural, it can be used at any level.
Essential oils can also have different considerations depending on the intended product and application area.
Can You Add Fragrance to Hair Oil?
Some hair oils include fragrance, but any fragrance material should be appropriate for the product and used within supplier recommendations.
A stronger scent is not necessarily better.
The goal is to create a pleasant product without compromising safety or performance.
Can You Add Vitamin E to Hair Oil?
Vitamin E is often used in oil-based cosmetic formulas.
It is commonly included as an antioxidant to help support the stability of certain oils.
However, vitamin E is not the same as a broad-spectrum preservative.
That distinction is important.
Antioxidants and preservatives serve different purposes.
Does Hair Oil Need a Preservative?
A traditional hair oil that contains no water has different preservation concerns than a water-based hair product.
However, you should still think about:
- Ingredient quality
- Oxidation
- Clean manufacturing practices
- Packaging
- Storage
- Shelf life
If water-based ingredients are added, preservation requirements change significantly.
If you plan to sell hair products, proper safety, stability, and regulatory considerations should be part of product development.
What Causes Hair Oil to Go Rancid?
Many plant oils can oxidize over time.
Signs of oxidation may include:
- Changes in smell
- Changes in color
- Changes in texture
- Overall decline in product quality
Light, heat, oxygen, and ingredient stability can all affect how a formula changes over time.
Keeping batch records can help you observe these changes.
How Do You Test a Hair Oil Formula?
Treat your first batch as Version 1.
Record:
- Ingredient names
- Percentages
- Batch size
- Date made
- Supplier information
- Texture
- Spreadability
- Greasiness
- Shine
- Absorption
- Scent
- Packaging performance
- Changes over time
Then revisit the product after several days and weeks.
How Do You Improve a Hair Oil Formula?
Start with one problem.
For example:
Problem: The oil makes fine hair feel too heavy.
Instead of replacing everything, change one ingredient or percentage.
Create Version 2.
Then compare it to Version 1.
If Version 2 feels lighter but does not provide enough slip, you now have useful information for Version 3.
This makes formulation much easier to understand than changing several things at once.
Why Should You Track Hair Oil Formula Versions?
Keeping clear records helps you avoid guessing later.
Track:
- Formula V1
- Formula V2
- Formula V3
- Ingredient percentages
- Ingredient weights
- What changed
- How the product felt
- Which hair type you tested it on
- Packaging notes
- What you want to adjust next
Good records make successful formulas easier to reproduce.
Can You Scale a Hair Oil Formula?
Yes.
If the formula is written in percentages and totals 100%, you can calculate ingredient weights for different batch sizes.
That means you can test a small batch before making a larger one.
Is Hair Oil a Good Product for Beginner Formulators?
Hair oil can be a useful beginner product because the basic structure may be simpler than a water-based hair cream or conditioner.
It can help you practice:
- Selecting oils intentionally
- Working in percentages
- Comparing textures
- Testing different blends
- Recording formula versions
- Evaluating packaging
These skills can help prepare you for more complex hair product formulas later.
What Should You Learn After Making a Hair Oil?
If you want to understand oil blends in another product category, read our How to Make a Body Oil Formula for Beginners guide.
If you are new to formulation overall, start with our Beauty Product Formulation for Beginners guide.
Want an Easier Way to Build and Organize Hair Product Formulas?
As you test different hair oils and other beauty products, keeping formula versions organized becomes increasingly important.
Formula Lab™ Beauty Product Studio gives you a place to build formulas, work with percentages, organize product ideas, and track what you are creating.