While seasoning a winter soup with a sprinkle of dried rosemary, you probably do not think of the herb as a hair-transforming ingredient. In oil form though, rosemary is gaining attention as a staple for hair growth, strength and shine. Curious how it works? Ahead, dermatologists and hair stylists explain the benefits of rosemary oil for hair, how to use it and potential side effects.
Rosemary oil for hair benefits
Rosemary oil is most often praised as a supporter of hair growth. “It has been clinically shown to increase hair growth similar to minoxidil, the main active ingredient in many over-the-counter hair regrowth treatments,” says board-certified dermatologist Dr Ramya Garlapati. “It stimulates hair growth by blocking the effects of DHT, a type of testosterone that is normally responsible for shrinking hair follicles that can lead to hair loss.”
Dr Garlapati adds that rosemary oil also stimulates blood flow to the hair follicles, “which increases the delivery of oxygen and nutrients, promoting hair growth,” and it has natural anti-inflammatory and antimicrobial properties, making it helpful for irritation caused by flaking and dandruff.
As an oil, it also adds a layer of moisture and shine, which can help reduce breakage, says celebrity hairstylist Sabrina Rowe Holdsworth.
What are the side effects of rosemary oil on hair?
Because it is a fairly potent ingredient, excess use of rosemary oil may lead to some itching and burning, says Holdsworth. “It can cause mild irritation of the scalp and should be discontinued if this is experienced,” adds Dr Garlapati.
That said, Dr Garlapati notes that rosemary oil is considered safe for all hair types, including colour-treated hair.
How to use rosemary oil for hair growth
First things first, Dr Garlapati says it is important to speak with a dermatologist to work out the cause of hair loss before trying to treat it at home. Once you have a diagnosis, rosemary oil can be one option for people who prefer a more natural approach.
“You can use rosemary oil on its own or add a carrier oil such as coconut or argan oil to dilute it,” says Dr Garlapati. “Keep in mind as you are diluting it you may be reducing the benefits of the rosemary oil as you will be minimising the amount applied to the scalp.”
Any pure rosemary essential oil is generally a good choice, she adds. Fellow dermatologist Dr Amanda Doyle notes that a pure, organic oil “is often the best way to go.”
How to dilute rosemary oil for hair
To make a simple treatment at home, Dr Doyle suggests mixing two tablespoons of your preferred carrier oil (she likes jojoba) with two to three drops of rosemary oil. Massage the blend into the scalp and “leave on for an hour before washing,” she says.
If you would rather not mix your own, you can look for ready-made hair oils, masks or shampoos that list rosemary oil as a key ingredient and are designed for use on the scalp.
How often should I put rosemary oil in my hair?
Holdsworth says rosemary oils and rosemary-infused shampoos can be used a few times a week, as long as your scalp tolerates them well. “I suggest starting with two to three times a week and if well tolerated, working up to daily,” adds stylist Jacob Schmidt. “Consistent use always yields the best results.”
If you notice irritation, itching or burning, stop using the product and check in with a dermatologist.
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