For centuries, cultures across the world have trusted natural oils to nourish and protect hair. From India to the Mediterranean, traditional hair oiling rituals were more than cosmetic — they were a form of scalp care long before modern science confirmed their benefits.

A 2022 review in the International Journal of Trichology revisited these time-honoured ingredients and highlighted one oil that continues to stand out: castor oil (Ricinus communis).

What Makes Castor Oil Unique?

Unlike lighter oils such as coconut or almond, castor oil contains a dense concentration of ricinoleic acid — a rare fatty acid with powerful moisturizing and protective properties.

According to the review, castor oil:

• Moisturises and seals the hair shaft to prevent dryness and breakage.

• Nourishes the scalp by penetrating deeply into hair follicles.

• Protects against microbes and fungi, helping to maintain a healthy scalp environment.

• May even play a role in reducing hair shedding by influencing prostaglandin pathways associated with hair growth.

Its germicidal and fungicidal actions, combined with its natural viscosity, make castor oil a favourite for both dry scalps and damaged hair.

The Science Behind the Shine

The researchers noted that ricinoleic acid not only softens and conditions hair but also helps strengthen the scalp barrier. When massaged into the roots, it can improve local circulation, supporting the delivery of oxygen and nutrients to hair follicles — a key factor in maintaining strong, glossy strands.

While more research is still needed to define the exact mechanism of action, dermatologists increasingly recognise castor oil’s potential role in scalp health and hair density.

How to Use It

Warm a small amount of castor oil between your palms and massage it gently into your scalp and through the lengths of your hair. Leave it on for at least 30 minutes before washing with a mild shampoo. For best results, repeat once or twice a week.

Where to Buy Castor Oil in Australia

Looking for where can I buy castor oil in Australia? Choose a cold-pressed, hexane-free variety for the purest results. This ensures you’re getting all the nourishing fatty acids without chemical residues — perfect for scalp hydration, natural shine, and long-term hair strength.

This post is for educational purposes only. Please consult your health practitioner for personalised advice before beginning any new hair or scalp treatment.