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Castor oil is the under-the-radar hair ingredient to keep your eye on

My current skin-care and hair-care pursuit: Finding an oil that balances the skin and scalp without leaving a trace of being there. It’s a tall order and only the best-of-the-best find their way to empties status. I’ve long loved argan oil for its ability to, at once, mend damage and help protect hair from hot tools, but lately, it’s castor oil’s benefits for hair that have been catching my attention.

“Castor oil comes from the seeds of a castor bean plant known as Ricinus communis,” says Dominic Burg, MD, chief scientist and hair biologist at Evolis Professional. “It’s considered to be poisonous, but the oil extracted from the seeds is quite beneficial for the hair.”

Like plenty of other natural oils (such as tea tree and eucalyptus, for instance), castor oil is pretty good at resetting strands. “Castor oil is commonly used to ward off skin infections since it’s a known antibacterial, anti-fungal ingredient,” says Dr. Burg. Another perk? It’s rich in fatty acids. “The oil’s high in vitamin E and omega 6 fatty acids, so it works as a brilliant hair conditioner and natural emollient.”

It’s also good for helping to revitalize your strands, according to Pedro Catalá, pharmacist, cosmetologist, and founder of Twelve Beauty. “It leaves the hair brighter also due to its high concentration of antioxidants.” He adds that it’s also rich with proteins and other nourishing minerals, which help to strengthen hair and over time and with repeated use make it stronger.

The thing about castor oil is that it’s very dense. “It doesn’t spread very well, so it takes forever to wash off, which can have a negative impact on the hair and scalp health,” says Catalá. Dr. Burg notes it “can be quite sticky and shouldn’t be used on its own.”

Either use the oil sparingly, or concoct your own castor oil hair serum. “I suggest blending with a carrier oil like jojoba or coconut, and mix a minimum of four parts carrier oil and one part castor oil,” recommends Dr. Burg. I’m two seconds away from pouring it all over my head. Keep scrolling for all of castor oil’s benefits for your strands.

Photo: Getty Images/Aliyev Alexei Sergeevich

Castor oil’s benefits for hair

1. It’s uber-hydrating and reparative: Since castor oil is a thick extract, it’s good for nourishing your hair. “Castor oil will protect your damaged ends from becoming overly parched due to the detergents found in shampoos or even the harshness of water,” says Dr. Burg. “Apply on the mid-lengths to help alleviate the dryness.”

2. It protects your hair from heat: If you apply castor oil to your strands, it’ll essentially act as a protectant—which is particularly good if you’re doing heat styling. “Apply the oil on semi-dry ends,” recommends Dr. Burg. “It protects against high heat appliances and helps to prevent frizzy results.”

3. It helps split ends: One perk I’m especially excited about is that it’s a good treatment for those dreaded split ends. “It’s a great split end mender,” says Dr. Burg. “Apply it on your dry hair as the last step in your styling process. It keeps frizzies at bay, in addition to smoothing the cuticle down to prevent the split ends.”

4. It can help with hair loss: It’s been a beauty myth that castor oil can help your hair grow. While there aren’t any studies about that, Catalá notes that it can help when it comes to hair loss. “Castor oil can be used on the scalp to help prevent and repair hair loss,” he says, adding that research even backs up that it could help.

5. It can help treat folliculitis: Folliculitis and dandruff are a pain, but they’re thankfully easy to treat, and castor oil can help with that situation. “Castor oil’s potentially beneficial for the treatment of folliculitis, dandruff, and scalp infections,” says Catalá. That’s due to the oil’s antifungal and antimicrobial properties.

6. It balances the pH of your scalp: Just like with your skin and nails, it’s good to balance the pH of your scalp, too. “The ricinoleic acid content in castor oil helps to balance the pH to your scalp, restoring the damage caused by harsh shampoos,” says Catalá. Fabulous.

By the way, clean hair care is coming to your shower in a major way. And this is how to get shiny hair with only cold water. 

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