Plus, where to buy the buzzy product.

Using rosemary oil for hair growth might not be the first thing that comes to mind when you think of the versatile herb. From cooking to aromatherapy, this age-old plant has many capabilities — and they extend into the beauty industry. Like finding the best hair masks and best hair oils, selecting the right rosemary remedy may transform your tresses.

How does rosemary oil for hair growth work?

Rosemary oil for hair growth is not a proven fix-all product, but some evidence has found it successful. “Studies show that rosemary oil can help micro-capillary perfusion, meaning it can support blood flow in the tiny capillaries where it’s applied,” explains Geeta Yadav, a board-certified dermatologist and founder of Facet Dermatology in Toronto.

In other words, increasing the blood flow to your hair follicles can support healthier growth.

Rosemary oil also has an antioxidant characteristic that may protect hair from environmental aggressors, such as UV radiation and pollution. “Rosemary oil comes from the Rosmarinus officinalis plant, with potential antioxidant and anti-inflammatory effects,” explains Monica Li, a Vancouver-based double board-certified dermatologist.

These anti-inflammatory components can help to foster a healthy scalp for hair growth (and keep symptoms like itchy scalp at bay).

Who can use rosemary oil?

This ingredient can be used on all hair types, whether your locks are thick or thin; colour-treated or natural. However, if you have sensitive skin, it might cause irritation, Li and Yadav warn.

To avoid a sore scalp, they advise patch testing a small area — like the wrist or behind the ears — before using it on your head. After two to three days of use, you’ll see if your skin tolerates it.

“There is no scientific data on the safety of rosemary oil on those who are pregnant or breastfeeding,” Li adds, noting that these individuals should avoid it.

How to use rosemary oil for hair growth at home

Good news: there are lots of ways to incorporate it into your routine. If you’re looking to avoid adding another step to your regimen, opt for a shampoo that uses the ingredient. And if you buy it in its purest form, be sure to mix it with a carrier oil like coconut, argon or avocado oil before applying.

Yadav suggests using about five drops mixed with at least one teaspoon of carrier oil.

“To get the best results, you should apply it directly to your scalp,” says Yadav. She advises putting it on after a shower and massaging it in for about 10 minutes. This part of the process is crucial because the massage will work to help promote blood circulation. “Regular scalp massage can also widen the hair follicles, which supports thicker hair.”

Rinsing is optional, but Li suggests doing so, as concentrated rosemary oil may irritate the scalp. To ensure you’re not rinsing the hard-working ingredients away, be sure you’ve left it in for at least 10-15 minutes. Most of all, before using any product, defer to the instructions on the packaging—every formula is unique.

How often should you use rosemary oil?

Consistency is key — especially at the beginning. “Ingredients supporting hair growth should be applied daily for best results, ideally twice a day,” says Yadav. “You could stretch it to every other day, especially after you start to see results, but the follicles need support to strengthen.”

Remember — if you don’t see results right away, that’s normal. “It takes at least five to six months of regular use of a rosemary oil-containing hair care product to see its effects,” says Li. “Be patient.”

The best rosemary oils for hair growth

Mielle rosemary mint scalp and hair oil

This bestseller boasts rosemary with a touch of mint. This nutrient-rich treatment combines biotin (a B vitamin) with over 30 essential oils and extracts. The formula is created to promote stronger hair and better length retention. Reviewers say it improves hair growth noticeably and may prevent hair loss.

Formulated without parabens or sulphates, it’s a clean-beauty product that can be easily factored into your routine. Comb a small amount through your ends for split-end management or massage into scalp for a more concentrated growth treatment.

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Rosemary and biotin shampoo

Swap your current shampoo for this rosemary-infused offering to be used several times a week. Alongside the titular ingredient, this shampoo is packed with feel-good components like primrose oil and plant proteins.

Thanks to its oil-blending properties, the formula promises healthier, thicker hair. Its subtle scent never overwhelms, making it perfect for lathering up and deeply moisturizing your scalp. Some reviewers even said it helped to reverse thinning and balding.

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Maple Holistics pure rosemary oil

If you’re looking for the purest form of rosemary oil, this product is the one for you. Free of any additional oils, this undiluted formula can be used in many different ways.

Loaded with antioxidants, it works to exfoliate and cleanse the scalp for shinier locks. Before applying, be sure to mix it with a carrier oil.

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Aromatica rosemary root enhancer

This ready-to-use root enhancer is packed with ingredients like salicylic acid and caffeine (which is also considered a stimulator for hair growth). Packaged in a spray bottle, the K-beauty product is oh-so-easy to use, as it’s meant to be spritzed on and left in all day. It boosts volume while protecting the health of the roots.

Dubbed a “spa experience in a bottle,” it works to remove dead skin cells that clog up scalp pores and leaves a cooling effect on the head. Promising to tackle thinning, damaged, or weakened hair, this leave-in spray leaves you feeling refreshed.

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Therapeutic-grade rosemary essential oil

Alongside the signature rosemary aroma, this product features notes of basil and eucalyptus. Plus, the ingredients list includes cooling aloe vera, celery and biotin. Reviewers love it for its ability to support hair growth and foster added shine.

This formula offers all the benefits of rosemary oil while being free of chemical additives. The glass bottle comes with a long-stem dropper for precisely measuring out your daily use. Made of 100% rosemary oil, this can also be used for aromatherapy.

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