Castor oil has a long history of use for hair growth and thickening. It has its devotees who swear by it for growing hair. From the scalp to beards and even brows or eyelashes, you’ll find a popular use for castor oil. However, is there any truth to this, or are castor oil’s hair-growing benefits just an old wives’ tale? In this article, we explore the science behind the benefits of castor oil and see how these measure up. We’ll also review how to use castor oil to improve your hair’s health and condition. Finally, we’ll see how it compares to other popular treatments like rosemary oil.
What is Castor Oil?
Castor oil is a vegetable oil derived from the seeds of the Ricinus communis plant. It is rich in fatty acids, particularly ricinoleic acid. This oil has a thick, viscous consistency and has been used in both skincare and haircare for centuries. Its nourishing and moisturising properties make it a popular choice for treating dry or irritated scalps. It is also often marketed for strengthening hair and promoting growth.
What’s the Science Behind Castor Oil for Hair Growth?
There really isn’t any strong scientific evidence showing that castor oil increases hair growth. To be honest, there aren’t even many higher-level studies on the effect of castor oil on hair growth. However, there is some data to suggest it can help improve scalp health. This, in turn, has a positive effect on the hair. Its benefits stem from its ability to improve scalp health. A healthy scalp then creates a protective barrier that reduces damage to the hair follicles and supports them. Castor oil is also believed to improve moisture and nourish the hair follicles, thanks to its high fatty acid content. This can help make the hair appear more moisturised and glossy. Additionally, castor oil’s antimicrobial properties may help prevent the scalp infections that can lead to hair shedding or loss.
Benefits for Hair
So based on the little data we have, although castor oil doesn’t boost hair growth, it can indirectly improve your hair. These are some of the key benefits of using castor oil on the scalp and hair:
- Moisturises dry scalp and hair: castor oil’s thick consistency helps lock in moisture, making it an excellent remedy for a dry scalp and hair. It hydrates the hair shaft, which can reduce brittleness.
- Prevents breakage: the nutrients and fatty acids in castor oil strengthen hair, making it less prone to breakage and split ends. This can result in fuller, healthier and glossier hair over time.
- Improves scalp health: thanks to its antimicrobial, anti-inflammatory and hydrating properties, castor oil can help protect the scalp from infections and irritation. Whilst some people use it to treat dandruff, it can actually trigger or worsen it sometimes. This is because it feeds the yeast that causes dandruff, so it’s best to avoid it here and seek alternatives.
- Improves the hair growth environment: by improving scalp health and hydration and nourishing the follicles, castor oil can boost the environment for hair growth.
How to Use Castor Oil
It’s fairly easy to use castor oil, but its thickness and stickiness can be off-putting initially. You also need to use it regularly to get benefits like moisturising and conditioning the hair. Here are some of our top tips for using castor oil in your hair care routine:
- Choose the right type: there are tonnes of options. Where possible, opt for cold-pressed organic castor oil to ensure it’s free from harmful chemicals. Some types are also thicker than others. For example, Jamaican black castor oil, known for its darker hue and thicker consistency, is a popular option for those with thick but damaged hair. Regular castor oils or light blends may be better if you have fine hair.
- Dilute with a carrier oil: castor oil can be quite thick and difficult to spread on its own. Mix it with lighter oils such as coconut, almond or jojoba oil to make it easier to apply and reduce its stickiness.
- Apply as a scalp treatment: this is great if your scalp is dry, itchy or irritated. Massage a small amount of castor oil into your scalp using gentle, circular motions. This stimulates blood circulation and helps the oil penetrate deep into the scalp. Leave it on for at least 30 minutes or, for best results, overnight before washing.
- Use as a hair mask: if your hair is dull, dry, brittle or has split ends, then this is a great option. Apply castor oil from root to tip and leave it on for several hours or overnight as a deep conditioning treatment. Wash it out with a mild shampoo to avoid residue buildup.
- Frequency: for best results, use castor oil up to 2 to 3 times per week (or less if you wash your hair less often). Be patient, as results can take several weeks to become noticeable.
Risks & Side Effects
Whilst castor oil is generally safe, like anything in life there is always a risk of something untoward. These are some potential side effects that can occur and how to avoid them:
- Allergic reactions: perform a patch test before using castor oil on your scalp. Some people may experience itching, rashes or irritation.
- Greasy residue: due to its thick consistency, castor oil can leave a greasy residue if not thoroughly washed out.
- Clogged pores: if used in excess, castor oil may clog pores on the scalp, leading to a build-up that can cause seborrheic dermatitis and scalp irritation.
Alternative Hair Oils
When it comes to hair health, there are so many different oils, all with different claims and benefits. Here are some of the most popular hair oils:
- Rosemary oil: this stimulates circulation and may inhibit DHT, a hormone linked to hair loss. As such, it is widely marketed for hair regrowth and preventing loss. Like castor oil, the evidence for rosemary oil is limited, but some small studies suggest it may help promote hair regrowth.
- Coconut oil: as it easily penetrates the hair shaft, coconut oil is excellent for deep conditioning. It may also protect against protein loss and so is useful for strengthening hair.
- Argan oil: this lightweight oil is rich in antioxidants. It improves hair elasticity and adds shine without leaving a greasy residue. As such, it is great for regular use as a leave-in hair treatment.
- Jojoba oil: it mimics the scalp’s natural sebum, making it great for balancing oil production. It can also hydrate both hair and scalp.
Although castor oil doesn’t directly grow hair, it still has benefits that make your hair look stronger and glossier. It works best as a nourishing hair treatment that can help improve scalp health, moisturise hair and prevent breakage. It also works well alongside other hair oils, especially if you’re experiencing dry strands, breakage or generally dull hair. There are still some studies exploring whether it can help indirectly with mild or early hair thinning. However, for noticeable hair loss, you shouldn’t waste your time. It is best to combine it with other clinically proven hair loss ingredients. Alternatively, skip it in favour of an actual hair growth treatment.
At City Skin Clinic, we are passionate about personalised skincare and hair regrowth treatments. Our online clinic offers safe and effective bespoke treatments with prescription-strength ingredients including tretinoin, hydroquinone, minoxidil, finasteride and dutasteride where appropriate. Our doctors treat a range of conditions like acne and scars, hyperpigmentation, melasma, skin ageing and hair loss. To start your personalised plan, book a virtual video consultation or use our online consultation form. The journey towards great skin and hair starts here.
This article is intended for general informational purposes only and is not a substitute for medical advice, diagnosis or treatment. Always consult a qualified medical provider for any health concerns or questions you might have.
