How to Use Rosemary Oil for Hair Growth (Expert Tips, Results & FAQs)
- OOF! Editorial Team
- Jul 14, 2025
- 6 min read
Updated: Apr 19
Rosemary oil might just be your new hair growth bestie.
If you’ve spent any time in the haircare corner of the internet lately, you’ve probably heard people talking about rosemary oil for hair growth.
But is it actually worth the hype?
The short answer: yes. And there’s real science behind it.
Here’s exactly how to use rosemary oil for hair growth, what results you can realistically expect, and the mistakes that could be holding you back.
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The Editors of OOF!
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Does Rosemary Oil Help Hair Growth?
Quick Answer
Rosemary oil may support hair growth by improving scalp circulation, reducing inflammation, and helping block DHT, a hormone linked to hair thinning.
To use it, mix 4 to 5 drops of rosemary essential oil with 1 tablespoon of a carrier oil like jojoba or grapeseed.
Massage it into your scalp, leave it on for at least 30 minutes (or overnight), then wash it out.
For best results, use it 2 to 3 times per week for at least 3 months.
What Is Rosemary Oil for Hair Growth?
Rosemary oil is an essential oil extracted from—you guessed it—rosemary, the herb you might already have in your spice rack.
But aside from making your roasted potatoes taste amazing, it also has some pretty powerful benefits for your scalp and hair.
Rich in antioxidants and anti-inflammatory compounds, rosemary oil is known for supporting scalp health, improving circulation, and creating a better environment for hair growth.
🧡 Pro Tip: If your hair never seems to respond to oils or treatments, your porosity might be the reason. Check out this guide to hair porosity to learn how to test your hair and why it can change the way your hair responds to products.
How Does Rosemary Oil Help With Hair Growth?
Hair oiling can support stronger, healthier hair over time, and rosemary oil is one of the few natural ingredients with research behind it.
It works by improving scalp health and creating a better environment for hair to grow, which is why it’s become a go-to for anyone trying to reduce shedding or boost density.
The Benefits of Rosemary Oil for Hair Growth
It Increases Blood Circulation to the Scalp
More blood flow means more oxygen and nutrients reaching your hair follicles, which helps support stronger, healthier growth over time.
It May Help Reduce DHT (The Hair Loss Hormone)
DHT is a hormone linked to thinning hair and hair loss, especially around the temples and crown.
Some research suggests rosemary oil may help reduce DHT activity similar to how minoxidil (Rogaine) works.
It Fights Inflammation and Dandruff
Rosemary oil has anti-inflammatory and antimicrobial properties that can help calm irritation, reduce flakes, and support a healthier scalp overall.
A healthy scalp is essential for healthy hair growth.
🧡 Pro Tip: Pair rosemary oil with a gentle scalp massager to boost circulation even more. Using a scalp massager helps distribute the oil evenly and can make a noticeable difference over time.
What the Research Says About Rosemary Oil for Hair Growth
A 2015 study compared rosemary oil to 2% Minoxidil, a common treatment for hair loss. After six months, both groups saw similar improvements in hair growth.
The difference? The rosemary oil group reported less scalp irritation, making it a gentler option for some people.
Why This Matters
Hair growth doesn’t start at your ends, it starts at your scalp. If your scalp isn’t healthy, your hair won’t be either. Learn how to build a scalp routine that actually supports growth.
How to Use Rosemary Oil for Hair Growth
To get the best results from rosemary oil, how you use it matters just as much as how often you use it.
The goal is to treat your scalp consistently while avoiding buildup or irritation.
Step-by-Step
Dilute the Rosemary Oil
Rosemary essential oil is highly concentrated and should never be applied directly to your scalp.
Mix 4 to 5 drops with 1 tablespoon of a carrier oil like jojoba, grapeseed, or castor oil.
If you prefer something pre-mixed, you can use a blend like Plant Therapy Rosemary and Castor Oil to skip the measuring and make it easier to stay consistent.
Apply to Your Scalp (Not Your Ends)
Focus on applying the oil directly to your scalp, not your ends. Hair growth starts at the follicle, so this is where it matters most.
Massage It In
Gently massage the oil into your scalp using your fingertips or a silicone scalp massager. Use circular motions to help boost circulation and evenly distribute the oil.
Let It Sit
Leave the oil on for at least 30 minutes. For deeper treatment, you can leave it on overnight.
Wash Thoroughly
Wash your hair thoroughly to remove any oil buildup. You may need to shampoo twice, especially if you’re using heavier oils like castor oil.
🧡 Pro Tip: After applying the oil, wrap your hair in a soft t-shirt hair towel like our HALO to help trap heat, boost absorption, and keep oil off your clothes or pillow. It makes the whole process way less messy.
How Often Should You Use Rosemary Oil for Hair Growth?
For best results, use rosemary oil 2 to 3 times per week.
Most people start to notice less shedding and stronger hair within a few months, but consistent use is key.
Real Talk: What to Expect
Don’t expect instant mermaid hair overnight. But with consistent use, many people notice less shedding, stronger strands, and improved overall hair health over time.
The key? Stick with it.
How Long Does Rosemary Oil Take to Work?
Most people need at least 3 months of consistent use to start seeing noticeable results.
In some cases, it can take up to 6 months to see fuller growth, depending on your hair type, scalp health, and consistency.
What Results Can You Expect?
Reduce shedding
Support thicker-looking hair
Improve scalp health
Encourage healthier, stronger strands
🧡 Pro Tip: If you’re trying to grow your hair out after damage, focusing on repair is just as important as growth. Check out our guide to repairing damaged hair to learn how to strengthen your hair so you actually keep the length you’re growing.
FAQs About Using Rosemary Oil For Hair Growth
Does rosemary oil actually help hair growth?
Rosemary oil may support hair growth by improving scalp circulation, reducing inflammation, and helping create a healthier environment for hair follicles.
Some research has even found it performs similarly to 2% Minoxidil over time, making it a popular natural option.
How long does it take for rosemary oil to work?
Most people need at least 3 months of consistent use to start seeing noticeable results.
In some cases, it can take up to 6 months, depending on your hair type, scalp health, and how consistently you use it.
Can I apply rosemary oil directly to my scalp?
No. Rosemary essential oil is highly concentrated and should always be diluted with a carrier oil before applying it to your scalp.
Applying it directly can cause irritation or sensitivity.
How often should I use rosemary oil for hair growth?
For best results, use rosemary oil 2 to 3 times per week. Consistency matters more than anything else when it comes to seeing results.
Can rosemary oil help with hair loss or thinning?
Rosemary oil may help reduce shedding and support thicker-looking hair over time, especially for certain types of hair loss.
However, results can vary, and it’s always a good idea to consult a dermatologist or trichologist if you’re experiencing significant hair loss.
Can I use rosemary oil on colored or chemically treated hair?
Jojoba and grapeseed oil are great choices because they are lightweight and unlikely to cause buildup.
Castor oil can also be helpful for hair growth, but it’s thicker, so it’s best mixed with a lighter oil for easier application.
Final Thoughts: Should You Try Rosemary Oil for Hair Growth?
If you’re looking for a natural, low-risk way to support your hair growth journey, rosemary oil is absolutely worth trying.
It’s simple, effective, and backed by research, but like most things in hair care, consistency is what makes the difference.
Stick with it, take care of your scalp, and give your hair the support it needs. That’s when you’ll start to see the difference.
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