Camellia japonica seed oil is the fixed oil expressed from the seeds of Camellia japonica L., a flowering plant belonging to the Theaceae family. The plant is commonly known as Japanese camellia and is sometimes referred to as the Christmas camellia because of its winter flowering period.

The oil is traditionally known as Tsubaki oil and is widely used in Japanese cosmetic and personal care applications. It should not be confused with tea seed oil derived from Camellia sinensis, the plant used to produce tea leaves.

Camellia japonica seed oil is sometimes referred to as Japanese tea oil, Japanese camellia seed oil, Tsubaki oil or white camellia seed oil.

Composition

Camellia japonica seed oil is predominantly composed of triglycerides containing monounsaturated and saturated fatty acids. Oleic acid is its principal fatty acid and typically represents around 80% of the total fatty acid composition.

A representative fatty acid profile includes approximately 9% palmitic acid (C16:0), 2% stearic acid (C18:0), 81% oleic acid (C18:1), 8% linoleic acid (C18:2) and approximately 0.5% linolenic acid (C18:3).

The reported average carbon number is approximately 17.91 and the average molecular weight is approximately 280.04. The exact composition can vary depending on cultivar, geographical origin, cultivation conditions and oil extraction and processing methods.

Function

Camellia japonica seed oil functions primarily as an emollient and skin-conditioning ingredient. Its high oleic acid content contributes to a smooth, lubricating skin feel and makes the oil suitable for formulations intended to soften and condition the skin.

In hair care formulations, the oil can provide conditioning and lubricating properties while helping to improve the sensory characteristics and manageability of the hair.

Cosmetic Applications

Camellia japonica seed oil is widely used in skincare and haircare formulations. It can be incorporated into facial oils, cleansing oils, creams, lotions, balms, hair oils, conditioners and other products where an emollient plant oil is desired.

Its relatively high oleic acid content gives it a substantive and protective sensory character. Compared with lighter oils containing higher proportions of polyunsaturated fatty acids, Camellia japonica seed oil may provide a somewhat richer and more substantial skin feel.

The oil is particularly associated with traditional Japanese hair and skin care and has been used historically to condition and maintain the appearance of hair.

Skin Benefits

Camellia japonica seed oil provides emollient properties that can help improve the softness and smoothness of the skin. Its lipid composition allows it to form part of the oil phase of cosmetic formulations and contribute to the replenishment of the skin's surface lipids.

The oil is also valued for its protective and conditioning sensory characteristics. Its high oleic acid content contributes to its relatively rich and substantive skin feel.

Research has investigated the biological activity of Camellia japonica seed oil, including potential anti-inflammatory effects. However, the biological activity demonstrated in experimental studies should not automatically be interpreted as a clinically established benefit of a cosmetic product containing the oil.

Anti-Inflammatory Activity

Experimental research has investigated the effects of Camellia japonica seed oil on inflammatory signaling pathways.

In an in-vitro study using lipopolysaccharide-induced inflammatory responses, Camellia japonica seed oil reduced activation of AP-1 and NF-κB promoters. It also attenuated LPS-induced phosphorylation of IκBα, ERK, p38 and JNK.

The study suggested that Camellia japonica seed oil may exert anti-inflammatory effects through downregulation of inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) expression, associated with inhibition of NF-κB and AP-1 signaling.

These findings provide a mechanistic basis for further investigation but should be distinguished from clinical evidence demonstrating an anti-inflammatory effect in humans.

Hair Care Applications

Camellia japonica seed oil has a long history of use in traditional Japanese hair care. It is used as a conditioning oil to improve the appearance, softness and manageability of hair.

The oil is particularly associated with traditional Japanese hairstyles, where Tsubaki oil has historically been applied to the hair. It can also be incorporated into modern hair oils, conditioners, masks and leave-in treatments.

Its lubricating properties can contribute to improved hair feel and reduce the dry or rough sensation associated with damaged or dehydrated hair.

Formulation Considerations

Camellia japonica seed oil is an oil-soluble ingredient and can be incorporated directly into the oil phase of anhydrous formulations or into the oil phase of emulsions.

It can be used in creams, lotions, balms, facial oils, cleansing oils, hair oils and other oil-based formulations. The final sensory profile will depend on the concentration of Camellia japonica seed oil and its combination with other emollients.

Because the oil contains a high proportion of oleic acid and smaller amounts of polyunsaturated fatty acids, its oxidative stability should still be considered during formulation development. Antioxidant systems and suitable packaging may be used where appropriate to help protect the oil from oxidation.

Stability

The stability of Camellia japonica seed oil depends on its fatty acid composition, processing history, storage conditions and exposure to oxygen, heat and light.

Although its high oleic acid content generally provides greater oxidative stability than oils dominated by polyunsaturated fatty acids, the presence of linoleic and linolenic acids means that oxidation can still occur.

Finished formulations containing Camellia japonica seed oil should therefore be evaluated under appropriate stability conditions. Packaging with suitable protection against oxygen and light can be considered where necessary.

Traditional and Other Uses

Camellia oils have a long history of use in Japan and other parts of East Asia. Tsubaki oil has traditionally been used for hair care and skin conditioning.

Camellia seed oils have also been used outside cosmetics for culinary purposes, including frying and food preparation, as well as in applications such as lubricants and soaps.

Camellia japonica seed oil has traditionally been associated with Japanese hair care, including its use for maintaining traditional hairstyles.

Safety

Camellia japonica seed oil is widely used as a cosmetic emollient and has a long history of topical application. As with other plant-derived oils, the safety of a finished cosmetic product depends on the purity and quality of the raw material, concentration, formulation, exposure conditions and intended population.

The possibility of individual sensitivity or irritation should be considered when developing finished products containing botanical oils. Appropriate safety and stability assessment should be conducted on the finished cosmetic formulation.

Regulatory Considerations

The regulatory status and permitted use of Camellia japonica seed oil may vary between markets and should be assessed according to the applicable cosmetic regulations of the target market.

Particular attention should be paid to the botanical identity of the raw material because Camellia japonica and Camellia sinensis are different species. The correct botanical source and corresponding INCI designation should therefore be confirmed with the raw material supplier and regulatory documentation.

References

Dweck, Anthony. Handbook of Natural Ingredients. Dweck Books.

National Center for Biotechnology Information. PubChem – Camellia japonica and related constituents.

European Commission. CosIng – Cosmetic Ingredients Database.

Lee, et al. Research investigating the anti-inflammatory activity of Camellia japonica oil through NF-κB and AP-1 signaling pathways.

Matsui, et al. Research on the fatty acid composition and physicochemical properties of Camellia seed oils.

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