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You might have heard that castor oil can do incredible things for eyelash growth. Unfortunately, the science doesn’t bear out that claim—and any lush-lash effect is likely more of an illusion. However, the oil may create a healthier environment for eyelashes to grow by keeping them moisturized, Dr. Waibel says. As with any new product, watch for signs of irritation (such as tenderness, redness, or itching) and stop using it if that happens. The biggest risk of using castor oil on your hair is potential scalp acne and build-up, since it’s so rich and occlusive.
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Castor oil should not cause these side effects when applied to your hair. However, you'll want to ensure you or others in your home do not accidentally swallow the castor oil. Diluting the castor oil can also tone down the scent, which many people find unpleasant.
Best Castor Oil Hair Products
Here's how you can take advantage of the powerful attributes of castor oil in your homemade hair care products to fight frizz, condition your strands, moisturize your scalp, and protect your hair. Castor oil is a favorite ingredient in hair products because it is nourishing to your scalp as well as your strands, thanks to its combination of vitamins, fatty acids, proteins, and antioxidants. Dr. Garshick points out that although castor oil can be used by all hair types, it is especially good for those with dry hair. But the condition of your scalp plays an important role when deciding to use castor oil on your hair or not. There is no scientific evidence showing that castor oil can promote hair growth.
Does castor oil increase hair growth?
But if your pet swallows a lot of castor oil, contact your vet immediately to see if they need emergency treatment. If you chew and swallow castor beans, ricin can be released and cause injury. Ricin is also in the waste that is produced in the manufacture of castor oil. One way that proponents of black castor oil support their position is by aligning it with the benefits of other essential oils. There is a lack of qualified studies on black castor oil and its effect on human hair.
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How should castor oil be applied to your hair and scalp?
The use of castor oil for hair dates back to 4000 BC in ancient Egypt. Castor oil has been claimed to have a slew of benefits, including strengthening strands, promoting hair growth, and nourishing dry scalp. And while the oil itself likely can't make the hair grow, it's loved for its ability to create a healthier environment on the scalp that makes for way better hair growth. The natural oil is believed to have properties that encourage hair growth, health, and thickness. And being that it supposedly has such an effect on hair, castor oil can be found in many hair care products, as well as brow and lash serums. 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.
Nikita Mehta, co-founder & creative director of ayurvedic haircare brand Fable & Mane. Simply add a dime- or quarter-sized amount to your hair before you swim depending on how thick and long it is, with a focus on the ends and dry areas first. Starting at the bottom of your hair, comb the warm oil mix through your hair. Do it quickly and wrap in a towel that you don't mind getting oil-stained. Wait 5-7 minutes, then get into the shower and rinse it off with more warm-hot water.
Best for itchy, flaky scalps: J.R. Liggett’s Tea Tree & Hemp Oil Shampoo Bar
TBH, no topical product alone can make your hair grow faster or prevent hair loss—only your hormones, genetics, health, and age can do that, explains Hill. Which is why “hair growth requires a comprehensive approach,” including healthy hair and scalp habits. Even though some people regularly use castor oil as part of their hair care routine, there’s no scientific evidence that castor oil helps promote hair health, stimulates hair growth, or reduces hair loss. Castor oil is derived from castor beans and is rich in protein, antioxidants, nutrients, and fatty acids, explains New York City-based board-certified dermatologist Marisa Garshick, MD. Castor oil is a thick vegetable oil that’s extracted from the bean of the tropical castor plant (or ricinus communis, if you want to get horticultural). Some of the benefits are thought to come from ricinoleic acid, an anti-inflammatory fatty acid that boasts antimicrobial and antioxidant properties.
Hair Products
There are tons of ways to use it—Kohatsu says it can operate like a cleansing oil for hair, prevent moisture loss or color fade, and improve hair quality naturally by being antibacterial and anti-inflammatory. “When we were in the beginning stages of formulating a new haircare collection, we wanted a main ingredient that really did everything,” Terry adds. “This oil has antibacterial and anti-fungal properties that help prevent dandruff (which is so helpful in colder months) and scalp infections." You’ll want to consider shampoo bars that have natural oils, including coconut and argan oil, and other moisturizing ingredients like glycerin and aloe vera, says Jordan. Also, look for options that use gentle surfactants rather than sulfates to cleanse the hair to TK.
What Are the Side Effects of Castor Oil?
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. While castor oil has long been touted as being beneficial for hair, it’s important to know if it’s right for your specific hair and scalp and the best way to incorporate it into your hair-care routine. That’s why we asked a range of hair experts—ranging from dermatologists, hairstylists, and trichologists—to take a deep dive into the pros (and any cons, of course) of castor oil for hair. Read on to find out more about castor oil, how it can benefit both hair and scalp, the absolute best application methods, products to try, DIY treatments, and more. These chemical components, especially the fatty acids, allow for the many castor oil benefits for hair. When massaged into the scalp and strands, the oil has moisturizing, soothing and circulation-stimulating properties, making it a useful home remedy for many common hair-related issues.
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. Like plenty of other natural oils (such as tea tree and eucalyptus, for instance), castor oil is pretty good at resetting strands, especially after excessive damage. "Castor oil is commonly used to ward off skin infections since it's a known antibacterial, anti-fungal ingredient," says Dr. Burg. "The oil's high in vitamin E and omega 6 fatty acids, so it works as a brilliant hair conditioner and natural emollient."
“Castor oil tends to have a moisturizing and nourishing effect on the hair, so typically those with dry, brittle, or curly hair may benefit most from use,” Dr. Luke says. Beth Gillette is the beauty editor at Cosmopolitan, where she covers skincare, makeup, hair, nails, and more across digital and print. Follow her on Instagram for makeup selfies and a new hair 'do every few months. One reviewer raves that this product is the first that's been able to soothe her and her children's itchy, dry scalps, calling it a "life saver." You can add 1-2 tablespoons of castor oil to your conditioning bottle and shake it up, or you could bring a teaspoon of castor oil into the shower and combine it with your conditioner in your hand. Then, put a tablespoon of castor oil in the palms of your hands and work it into your hair, starting with the ends first.
With strict editorial sourcing guidelines, we only link to academic research institutions, reputable media sites and, when research is available, medically peer-reviewed studies. Note that the numbers in parentheses (1, 2, etc.) are clickable links to these studies. Good Housekeeping participates in various affiliate marketing programs, which means we may get paid commissions on editorially chosen products purchased through our links to retailer sites.
And dare I say, it's the reason I constantly get compliments on my healthy, smooth, long hair. Keep reading for my product recommendations, as well as how to properly oil your hair and how often you should be hair oiling, according to experts. Because it's rich in fatty acids, castor oil has moisturizing effects. You can also use it in its natural form, which is free of perfumes and dyes. Because it can be irritating to skin, try diluting it with another neutral oil. Though many people use castor oil as a treatment for dry or thinning hair, there’s no evidence that castor oil is effective for improving hair health or stimulating hair growth when used on its own.
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