Rosemary Oil For Hair Growth: What The Study Found, And Who It Left Out

If your feed has turned into a parade of droppers, hair parts and a few drops of something green, you're not imagining it. Rosemary oil is everywhere.

The idea is simple. Dilute a few drops, massage them into your scalp a couple of times a week, and wait for thicker hair. No prescription. No salon. Just the herb that used to live in your spice rack.

Unlike most hair trends, this one has a published study behind it, which made us curious instead of suspicious. So we did what we do with every trend in our Trend or here to stay? series. We found what the experts actually publish, read it, and made our call.

Spoiler: it's in the title.

What dermatologists say about rosemary oil

Our source is Cleveland Clinic. Its public article, Rosemary Oil for Your Hair: How It Works, was reviewed by dermatologist Shilpi Khetarpal, MD, in January 2026.

It reports that when rosemary oil has been compared with minoxidil, the active ingredient in Rogaine®, it has been found as effective at encouraging regrowth. Dr. Khetarpal's explanation comes down to feeding the follicle. Massage the oil in, boost blood flow, and "you give your hair the nutrients it needs to shed less, grow more and just be a bit healthier."

On timing, she doesn't sugarcoat it: "You're going to need to use it two or three times a week for six months to see meaningful improvement." Then:

Stay consistent and give it time.

Shilpi Khetarpal, MD, Cleveland Clinic

The study backs her up. Here's what it tested, in plain English.

Published

Skinmed, 2015

Who

100 people with pattern hair loss

Compared

Rosemary oil vs. 2% minoxidil, 50 people each

At 3 months

Neither group had changed much

At 6 months

Both had improved, about equally

Notice who was in it, though. A 2024 review of the research describes the participants as men aged 18 to 49, and it reports no rosemary oil trial in women. That doesn't mean it won't work for you. It means nobody has shown it yet. It's also the question worth asking about anything you put on, or in, your body: who was it studied in?

Why rosemary oil is here to stay

Most hair trends fall apart once you read the source. This one held up.

It's cheap, it's simple, and a dermatologist tells you exactly how to use it. The only thing it asks for is patience.

We've been in beauty for more than 10 years, and the trends we see stick are the ones that reward consistency. Rosemary oil does, on your scalp, a few nights a week. That's why we think it's here to stay, as long as you give it the full six months.

How to use rosemary oil for hair growth

Think of it as a slow-cooker recipe, not a microwave one. These are our how-to tips, and where a step comes from Cleveland Clinic, we say so.

1. 01Patch test first. Cleveland Clinic suggests trying a small area of your scalp before you go all in, especially if you have fine hair or eczema.
2. 02Dilute it. Mix a couple of drops into a carrier oil like jojoba or coconut. Cleveland Clinic notes that straight rosemary oil can irritate your skin.
3. 03Massage it into your scalp. Your scalp, not your ends. "Really focus on working it in," says Dr. Khetarpal.
4. 04Sleep on it. Dr. Khetarpal suggests applying it at night and washing it out in the morning. Two or three nights a week.
5. 05Judge it at six months, not three. Take a photo on day one so you have something real to compare.
6. 06Keep it going from the inside. Your oil works on your scalp a few nights a week. HairRx works from the inside every day. It's our hair gummy, with 30mg of Ceramosides®, an ingredient studied in a randomized, placebo-controlled trial of 60 women. Two a day.

More isn't better. Too much rosemary oil can irritate your scalp, so stick to a few drops, and skip it if you're pregnant or breastfeeding.

HairRx

You try the trends. HairRx works from the inside, supporting stronger, thicker hair while you do. Our hair gummy, made with Ceramosides®. Two a day.

Shop HairRx

Quick answers

Does rosemary oil really grow hair?

In one six-month trial in men with pattern hair loss, it improved hair count about as much as 2% minoxidil. Cleveland Clinic says more research is needed.

How long does rosemary oil take to work?

About six months, used two or three times a week. In the study, neither group had changed much at three months.

Does rosemary oil work for women?

Not proven yet. The trial was in men, and the 2024 review we read reports no rosemary oil trial in women.

Can you use rosemary oil and HairRx together?

They work in different places: rosemary oil on your scalp, HairRx from the inside. If you're pregnant, breastfeeding or managing a health condition, check with your doctor before starting either.

xo, Glotrition

Source: Cleveland Clinic, Rosemary Oil for Your Hair: How It Works. Study: Panahi et al., Rosemary oil vs minoxidil 2% for the treatment of androgenetic alopecia, Skinmed, 2015. Ceramosides® study references are on our HairRx page.