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NYC-based dermatologist and hair loss specialist Dhaval G. Bhanusali, M.D. "There is some proposed benefit of castor oil with improving penetration of topicals and even hair growth," he says. Castor oil has natural antibacterial and antifungal properties and is high in vitamin E, minerals, proteins, and omega-6 and -9 beneficial fatty acids.
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If you allow for a nerdy moment, you’ll see why castor oil is basically engineered for haircare. Examining the molecular composition of castor oil reveals it as a glycerol bonded with long-chain fatty acids, which are crucial for hair follicle nourishment. The hair shaft's outer layer consists of overlapping scales known as cuticles. Damage causes these scales to stand up, leading to frizz and loss of shine.
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13 best hair oils for healthy, hydrated hair - NBC News
13 best hair oils for healthy, hydrated hair.
Posted: Wed, 23 Aug 2023 07:00:00 GMT [source]
She has nearly two decades of experience and completed her residency along with a clinical research fellowship at Columbia University. Since then, in addition to practicing dermatology, she has founded her own skincare line, Maei MD. It can be used more often, though I didn’t see any increased results with using it daily. Castor oil is extremely thick and viscous so I prefer to mix with jojoba or argan oil in a glass dropper bottle for easy application. Many swear by using castor oil on brows and lashes to reap the same benefits as those outlined here.
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Coconut oil contains both medium and long-chain fatty acids that strengthen hair and help prevent hair damage (10). The oil penetrates the hair cuticlesi XThe outermost layer of the hair shaft that forms from the accumulation of dead cells and protects the hair from damage. And hair cortexi XThe middle layer of the hair shaft between the hair cuticle and the medulla that provides the hair with its pigment. It safeguards against the damaging effects of chemical hair treatments (11). Coconut oil also reduces protein loss from chemically-treated and untreated hair (12). Whether you’re looking to use the oil for its moisturizing properties or want to challenge growth claims for yourself, there are plenty of ways to incorporate castor oil into your hair care routine.
Applying Castor Oil to Eyebrows and Eyelashes

Beth Gillette is the beauty editor at Cosmopolitan with more than five years of experience researching, writing, and editing skincare stories that range from hair-growth devices to hair botox. She’s an authority in all hair categories, but is an expert when it comes to castor oil for hair growth after testing dozens of hair growth products to finally grow-out her perpetual lob. She regularly tests and analyzes hair products for efficacy, while working with the industry’s top trichologists and hairstylists to assess new formulas and brands. Castor oil also contains omega-6 fatty acids—a type of essential fatty acid that may promote hair growth and reduce inflammation in the hair follicle.
✓ Scalp soother
If you’re looking for a more affordable option to help with hair growth, consider using castor oil. Not only is it inexpensive, but TikTokers, celebs like Selena Gomez and Helen Mirren, and even derms agree that it’s an effective and natural way to keep your hair strong and healthy. If you're using castor oil as a leave-in treatment, Dr. Clay recommends warming a small amount of the oil between your palms and smoothing it along the ends of your hair on a weekly basis. FWIW, rosemary oil has also been studied for hair growth and loss, showing promising results (but more research def needs to be done on humans to prove anything). Patients also noticed less irritation and itchiness with rosemary oil, since it's naturally anti-inflammatory.
What is the best type of castor oil to use?
“There are limited studies that demonstrate castor oil’s direct effect on hair growth. However, there are many indicators that suggest that it could certainly play an indirect role in contributing to the healthy growth of hair,” Kohatsu explains. The oil’s ricinoleic acid increases scalp blood flow, which can promote healthier hair and growth while also cutting down on inflammation. Despite it not being a reliable hair growth treatment, castor oil can be a worthwhile ingredient for scalp and hair health. With all of its proven benefits, “castor oil may promote a healthy environment for hair regrowth,” Dr. Garshick adds.
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Improving the oil's consistency and its effectiveness can be achieved by warming the oil between your hands before application. This makes the oil more manageable and enhances its penetration into the scalp and hair. Note that there have been reports of of allergic reactions to castor oil on skin, Butler says. Because of this, and the chance of contracting allergic dermatitis, Dr. Amin advises to apply only a small amount on a hidden area of skin (a DIY patch test) before using castor oil all over your head. The content of this website is not intended to offer personal medical advice. Additionally, castor oil forms a protective layer over your hair, shielding it from potential damage caused by environmental factors.
One study found that ricinoleic acid can help inhibit prostaglandin D2 (PGD2). Well, PGD2 are the inflammation causing compounds present in high levels in bald scalp of men (2). And their elevated levels is one of the factors for hair loss and follicle miniaturisation.
Olive oil contains a high proportion of mono- and poly-unsaturated fatty acids that may protect the hair moisture barrier and seal the moisture. In a study on telogenic mouse skin, topical administration of 0.4 mg olive oil resulted in anagenic hair growth (an active growth phase of hair follicles) (9). While some massage it on the scalp and leave it on for 2-3 hours before washing it away, others leave the oil on overnight. Check the following recipes for the effective application of castor oil for hair loss prevention and promoting hair regrowth. A study showed that rosemary oil helps treat androgenic alopecia (hormonal hair loss) and promotes effective hair growth (21).
As one shopper wrote, ” I do this twice a week and it works extremely well for me. I have hair growth and thickening, my fine thin hair has a much better texture too! Our mission at SheKnows is to empower and inspire women, and we only feature products we think you’ll love as much as we do. QVC is a SheKnows sponsor, however, all products in this article were independently selected by our editors. Please note that if you purchase something by clicking on a link within this story, we may receive a small commission of the sale. Leave on for minutes, then rinse out with shampoo to remove the oil.

If you’re considering applying pure castor oil to your eyebrows and eyelashes, Dr. Green advises using caution when applying it to delicate areas such as your eyes. If you’re set on using the oil in any of these areas, a cotton swab is an easy way to control the amount. Hair loss is a very complex condition that can be caused by a myriad of things. If you are dealing with hair loss, we recommend making an appointment with a board-certified dermatologist who specializes in hair loss and scalp conditions.
I tried it as well and it seemed to work about the same as regular castor oil on my hair, but it seems that it might provide additional benefit for those with thick or dry hair (my hair is fine/oily). When you're on the lookout for castor oil, you'll bump into a couple of different types. There's the regular, yellow castor oil, which is pure and simple, liquid gold—straight-up goodness from the seed to your hair.
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