Benefits, Uses, and Scientific Evidence

Castor oil is a highly valued carrier (fixed) oil distinguished by its exceptionally high viscosity and rich texture. It is widely used to support hair, eyebrow, and eyelash care, strengthen the skin barrier, promote wound healing, and provide anti-inflammatory support.

Unlike most vegetable oils, castor oil is biochemically unique because of its exceptionally high ricinoleic acid content. Modern research has focused particularly on its anti-inflammatory and antimicrobial potential.

Castor Oil – General Information

Botanical (Latin) Name:Ricinus communis

Origin: Native to Africa; widely cultivated in India, Brazil, and China

Extraction Method: Cold-pressed

Plant Part Used: Seeds

Color: Pale yellow to light golden

Texture: Very thick and highly viscous

Comedogenic Rating: 1

Suitable Skin Types: Dry, mature, and sensitive skin; ideal for eyelash, eyebrow, and scalp care

Note: Although the castor seed itself is toxic because it contains ricin, properly cold-pressed castor oil does not contain ricin.

Chemical Composition (Key Active Components)

The therapeutic properties of castor oil are primarily attributed to its exceptionally high ricinoleic acid content, including:

• Ricinoleic acid (approximately 85–90%) – the primary active constituent
• Oleic acid
• Linoleic acid
• Palmitic acid
• Stearic acid

These components are responsible for castor oil’s anti-inflammatory, moisture-retaining, and film-forming properties.

History and Traditional Use

Castor oil (Ricinus communis) is a multipurpose botanical oil that has been used for thousands of years. Historical records document its use in the Ebers Papyrus of Ancient Egypt (around 1500 BCE) as well as in Indian texts dating to approximately 620–650 BCE. Historical sources also indicate that castor oil was introduced from India to China about 1,400 years ago, where it became part of traditional medical practice.

In traditional medicine, castor oil has been used for hair and scalp care, wound protection, and, when taken internally, as a laxative and digestive aid.

Within Ayurveda and traditional folk medicine, it has also been used to support joint discomfort and intestinal parasite management. For topical use, castor oil has traditionally been applied to the hair, eyebrows, and eyelashes to help improve their appearance and density.

Castor oil is notable for its exceptionally high concentration of monounsaturated fatty acids, particularly ricinoleic acid (approximately 85–90%). It also contains vitamin E (tocopherols and tocotrienols), phospholipids, and phenolic compounds. These bioactive constituents contribute to its nourishing, moisturizing, and protective properties.

Benefits of Castor Oil

1. Support for Hair, Eyebrows, and Eyelashes

Castor oil is widely used as a supportive treatment for hair loss, sparse eyebrows, and strengthening eyelashes. [1] [2]

2. Anti-Inflammatory Activity

Ricinoleic acid may provide soothing effects for inflammation, skin sensitivity, and mild irritation. [3] [4]

3. Moisture Retention and Skin Barrier Support

Its thick consistency forms a protective film over the skin, helping reduce transepidermal water loss (TEWL). [5]

4. Wound Healing and Tissue Protection

Experimental studies have demonstrated that castor oil may support wound healing and help protect skin tissue. [6] [7]

Castor oil has also traditionally been used to help improve the appearance of dark spots, age spots, and skin discoloration.

Safety Information

• Castor oil is generally well tolerated.
• Because of its very rich texture, it should be used cautiously on oily skin.
• Oral use should only be undertaken under medical supervision.

Scientific References

[1] Kesika, P., et al. (2023). Role and Mechanisms of Phytochemicals in Hair Growth and Health. Pharmaceuticals (Basel). 16(2):206.

[2] Girdler, K., Cabatu, A., Olds, H., et al. (2026). Use of Castor Oil in Dermatology: A Narrative Review. Cureus. 18(2):e103289.

[3] Vieira, C., et al. (2000). Effect of Ricinoleic Acid in Acute and Subchronic Experimental Models of Inflammation. Mediators of Inflammation. 9(5):223–228.

[4] Yeboah, A., Ying, S., Lu, J., Xie, Y., Dede, H. A., Boateng, K. G. A., Chen, M., & Yin, X. (2020). Castor Oil (Ricinus communis): A Review on the Chemical Composition and Physicochemical Properties. Food Science and Technology (Campinas).

[5] Purnamawati, S., et al. (2017). The Role of Moisturizers in Addressing Various Kinds of Dermatitis: A Review. Clinical Medicine Research. 15(3–4):75–87.

[6] Nada, A. A., et al. (2018). Bioactive Polymeric Formulations for Wound Healing. Polymer Advanced Technologies. 29(6):1815–1825.

[7] Abomughaid, M. M., et al. (2024). A Phytochemical and Pharmacological Review of Ricinus communis L. Discover Applied Sciences. 6:315.