Essential oils play an important role in the world of natural cosmetics. Their aromas, plant-based origins and different applications have led more and more people to become interested in them and consider incorporating them into their personal care routines.
Lavender, rosemary, tea tree, orange and eucalyptus are some of the best-known essential oils. Each has a different aromatic composition and specific characteristics that determine its potential applications.
However, using essential oils requires more than simply knowing what they smell like. They are concentrated substances that must be handled correctly, and their application depends on the type of oil, its intended purpose and each person's individual characteristics.
In this guide, we explain what essential oils are, how they are obtained, how they differ from vegetable oils and what you should consider to use them responsibly.
What Are Essential Oils?
Essential oils are concentrated mixtures of volatile aromatic substances that occur naturally in different parts of plants, such as flowers, leaves, bark, roots, fruits and seeds.
These substances form part of the chemical composition of plants and are responsible for many of their characteristic aromas.
Unlike conventional vegetable oils, essential oils are not primarily composed of fats. They are complex mixtures of aromatic compounds, such as terpenes, alcohols, esters and other volatile components.
Their composition may vary depending on the plant species, the part used, the growing location, harvesting conditions and the extraction process.
For this reason, two essential oils obtained from plants belonging to the same genus may have different characteristics.
How Are Essential Oils Obtained?
Extraction is a fundamental part of producing an essential oil. The method used influences its composition and the characteristics of the final product.
Steam Distillation
This is one of the most common methods. It involves passing water vapour through the plant material. The steam helps release the volatile compounds, which are subsequently cooled and separated from the water.
This method is used to obtain numerous essential oils from flowers, leaves, branches and other parts of plants.
Cold Expression
This method is mainly used to obtain essential oils from the peels of certain citrus fruits, such as oranges and lemons.
In this process, the aromatic components present in the peel are extracted through mechanical procedures.
Other Extraction Methods
Some delicate plant materials require specific procedures to obtain their aromatic components. In these cases, extraction techniques other than conventional distillation may be used.
It is important to distinguish between a genuine essential oil, an aromatic extract and a fragrance. Although all of them can be used to add scent to certain products, they are not necessarily the same thing.
What Are Essential Oils Used For?
Essential oils have a variety of applications, particularly in perfumery, cosmetics and indoor fragrance.
Their use depends on the characteristics of each oil and the intended purpose of the product.
1. Adding Fragrance to Cosmetics
One of the most common uses of essential oils is to provide aromatic properties to creams, soaps, lotions and other cosmetic products.
Lavender, rosemary, orange and other essential oils can be used to create different aromatic profiles.
In cosmetics, their incorporation must take into account their composition, concentration, applicable restrictions and the safety of the finished product.
A cosmetic product is not more effective or necessarily better simply because it contains a higher amount of essential oils.
2. In Hygiene and Personal Care Products
Some essential oils are included in the formulations of soaps, shampoos, shower gels and other hygiene products.
In these cases, they can contribute to the product's aromatic profile and form part of a formulation designed for a specific purpose.
It is important to remember that the fact that an essential oil is used in a soap or rinse-off product does not mean it can be applied directly to the skin without dilution.
3. Indoor Fragrance
Essential oils are also used to add fragrance to indoor spaces through suitable diffusion devices.
Some people prefer floral scents, such as lavender, while others favour citrus, herbal or fresh notes.
The choice depends on personal preferences. Diffusion devices should be used according to the manufacturer's instructions, adequate ventilation should be maintained, and the presence of children, animals or people sensitive to fragrances should be taken into account.
4. Perfumery and Fragrance Composition
Perfumery uses numerous natural and synthetic ingredients to create aromatic compositions.
Essential oils can provide citrus, floral, herbal, spicy or woody notes, depending on their origin and composition.
In a perfumery formula, each ingredient contributes to creating a balanced combination of aromas.
Best-Known Essential Oils and Their Characteristics
There are numerous essential oils, each with its own composition and aromatic profile. Here are some of the best-known examples.
Lavender Essential Oil
Lavender is one of the most popular essential oils due to its floral and herbal aroma.
It is commonly used in perfumery, indoor fragrance and cosmetic formulations.
Its aroma is familiar in soaps, creams and other personal care products.
Rosemary Essential Oil
Rosemary has a fresh, intense and herbal aroma.
It is used in perfumery, cosmetic products and aromatic compositions. Its distinctive profile makes it a common ingredient in personal care formulations.
Tea Tree Essential Oil
Tea tree essential oil is known for its intense, herbal and medicinal aroma.
It is used in certain cosmetic formulations and hygiene products. However, its use requires particular attention to concentration and individual tolerance, as it may cause irritation or allergic reactions.
Orange Essential Oil
Orange essential oil has a sweet, fresh and citrus aroma.
It is used in perfumery, cosmetics and indoor fragrance. It is important to distinguish between different types of citrus oils, as some may present phototoxicity risks when applied to the skin before sun exposure.
Eucalyptus Essential Oil
Eucalyptus has a fresh, intense and distinctive aroma.
It is used in aromatic compositions, perfumery and certain personal care products.
As with other essential oils, its use must follow the product-specific recommendations and relevant precautions.
What Is the Difference Between an Essential Oil and a Vegetable Oil?
This is one of the most common questions when we first become interested in natural cosmetics.
Although both come from plants, they are very different ingredients.
Essential oils are concentrated mixtures of volatile aromatic compounds. They are generally obtained through distillation or expression and are characterised by their intense aroma.
Vegetable oils are mainly obtained from seeds, fruits or the fatty parts of plants. They are primarily composed of lipids and are used in cosmetics for their emollient properties and their ability to soften the skin.
Examples of vegetable oils include olive oil, jojoba oil, sweet almond oil, sunflower oil and argan oil.
In cosmetics, both types of ingredients can be part of the same formula, but they serve different functions.
A vegetable oil can be used as an emollient ingredient or as a carrier to dilute certain essential oils when the application and formulation allow it.
We should not confuse them or use an essential oil as if it were a conventional vegetable oil.
How to Use Essential Oils Safely
Although they come from plants, essential oils are concentrated substances. For this reason, it is important to understand their characteristics and follow the recommended guidelines for use.
Do Not Apply Them Directly to the Skin
Many essential oils can cause irritation or sensitisation when applied undiluted.
For certain skin applications, carrier vegetable oils or other suitable vehicles are used, always respecting the recommended concentration for each oil and intended purpose.
There is no universal dilution ratio that applies to all essential oils, all people and all uses.
Do Not Ingest Them on Your Own Initiative
Essential oils should not be used as drinks, supplements or homemade remedies for ingestion.
Ingestion can cause adverse effects, and some oils may be toxic even in small quantities.
Oral use requires specialist assessment and should never be improvised.
Be Careful with Sun Exposure
Some essential oils obtained from citrus fruits may contain phototoxic components.
This means that, under certain conditions, applying them to the skin may increase the risk of skin reactions when subsequently exposed to ultraviolet radiation.
For this reason, it is important to know the exact type of oil, its extraction method and the applicable restrictions before using it on the skin.
Be Aware of Possible Allergies
Some aromatic components present in essential oils may cause sensitisation or allergic reactions in certain people.
If you have a history of allergies to perfumes or fragrances, carefully check the composition of the products you use.
The fact that an ingredient is natural does not guarantee that it is suitable for every skin type.
Take Precautions with Children, Pregnancy and Pets
The use of essential oils requires particular caution in certain circumstances.
Not all oils are suitable for children, during pregnancy or while breastfeeding. Nor are all essential oils safe for domestic animals.
Before using them in these situations, it is advisable to consult a healthcare professional or veterinarian, as appropriate.
These precautions are important because safety depends on the specific oil, its concentration, the route of exposure and the characteristics of the person using it.
How to Choose a Good Essential Oil
If you are thinking about buying essential oils, there are several aspects worth checking.
1. Botanical identification. Make sure the product indicates the botanical name of the plant. This helps distinguish between species that may have different compositions.
2. Part of the plant used. The same plant may provide different aromatic products depending on which part is used.
3. Extraction method. Distillation and expression are among the methods used. Knowing the method helps you identify the product more accurately.
4. Information about its composition. Look for products that provide clear information about their identity, origin and characteristics.
5. Intended use. Not all essential oils are suitable for the same applications. Check the manufacturer's instructions before using them.
6. Storage. Essential oils must be stored correctly, protected from light, heat and air, following the supplier's instructions.
At Natural SHUI, we believe that understanding ingredients is a fundamental part of making informed choices. That is why we also recommend reading our article on how to read the ingredients of a natural cosmetic product and understand the INCI list.
Essential Oils and Natural Cosmetics: A Combination That Requires Knowledge
Essential oils can provide interesting aromatic properties to numerous natural cosmetic products.
However, incorporating them requires knowledge of their composition, concentration, compatibility with other ingredients and possible restrictions on use.
In a cosmetic formula, it is not enough to choose an essential oil simply because of its aroma. Its safety, stability and suitability for the finished product must also be assessed.
In the European Union, aromatic ingredients that fall within the substances regulated as fragrance allergens must be individually declared on the label when they exceed the established thresholds. Regulation (EU) 2023/1545 expanded the list of substances subject to these labelling requirements. From 31 July 2026, new products placed on the market must comply with the updated requirements; certain products previously placed on the market benefit from a transitional period until 31 July 2028.
This allows consumers to access more information and identify aromatic ingredients to which they may be sensitive.
You can consult the European Commission's official information on fragrance allergen labelling in cosmetics.
Frequently Asked Questions About Essential Oils
What Is the Difference Between an Essential Oil and an Aromatic Essence?
An essential oil is a mixture of volatile substances obtained from plant material through processes such as distillation or expression. An aromatic essence or fragrance may be a natural composition, a synthetic composition or a combination of both. They are not interchangeable terms.
Can Essential Oils Be Applied Directly to the Skin?
In general, applying pure essential oils directly to the skin is not recommended. Many require dilution and a prior safety assessment based on the oil and its intended use.
Are Essential Oils the Same as Vegetable Oils?
No. Essential oils are mainly composed of volatile aromatic compounds, whereas vegetable oils primarily contain lipids and are commonly used as emollient ingredients.
Are All Essential Oils Suitable for Indoor Fragrance?
Not necessarily. Products suitable for diffusion should be used, following the manufacturer's instructions. Ventilation and the presence of sensitive people or animals must also be taken into consideration.
Can Essential Oils Cause Allergies?
Yes. Some of their aromatic components can cause sensitisation or allergic reactions in susceptible individuals. It is important to check the composition and avoid ingredients that have previously caused reactions.
How Should Essential Oils Be Stored?
They should generally be kept in their original containers, tightly closed and protected from light and sources of heat. It is also advisable to follow the manufacturer's instructions and avoid using them if their characteristics have changed.
Conclusion: Get to Know Essential Oils Before Using Them
Essential oils are plant-derived ingredients with a wide variety of aromas and applications in perfumery, cosmetics and indoor fragrance.
Their appeal should not make us forget that they are concentrated substances requiring responsible use. Understanding their origin, composition, purpose and precautions is essential for choosing them correctly.
At Natural SHUI, we believe in natural cosmetics where every ingredient has a purpose and is selected according to the characteristics of the formulation.
Discover our selection of natural essential oils and learn more about the ingredients that are part of the world of natural cosmetics.