Camphor vs Rosemary Oil for Hair: Where the Evidence Stands
Rosemary oil has one 100-person trial against minoxidil 2 percent and a smaller four-oil blend trial behind it. Camphor oil has no human hair trial that we could find. So for hair-growth questions the comparison is lopsided, and camphor's honest role in hair care is a scent role, not an evidence-backed one.
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"Camphor vs rosemary for hair" is really three questions in one: does either have a trial behind a hair-growth claim, are the oils even separate materials, and which one belongs in a scalp product at all. We take them in that order. We do not make hair claims for our oil, which is sold as an aromatic material, and nothing below says that either oil grows hair.
If you need to understand why hair is thinning, the useful first step is a dermatologist, who can distinguish patterns of loss that no oil addresses. Our own broader pieces, Camphor Oil for Hair and Scalp and the earlier scalp-scenting article a cooling note for scalp scenting, stay on the scent side for the same reason.
What the rosemary studies actually did
Two human trials carry nearly all of rosemary's reputation for hair, and neither is a rosemary-only placebo trial of the kind people imagine.
| Study | Design | Preparation and comparison | Reported result | Limits |
|---|---|---|---|---|
| Panahi et al., 2015 | Randomized comparative trial, 100 people with androgenetic alopecia (50 per arm), 6 months | Rosemary oil against minoxidil 2% | No significant hair-count change at 3 months in either group; significant increase from baseline at 6 months in both; no significant difference between the groups. Scalp itching rose in both groups, and was more frequent with minoxidil | No placebo arm; the abstract does not give the oil's concentration or composition |
| Hay et al., 1998 | Randomized double-blind, 86 people with alopecia areata (patchy hair loss), 7 months | Thyme, rosemary, lavender and cedarwood oils in jojoba and grapeseed carriers, massaged daily, against carriers alone | Improvement in 19 of 43 (44%) in the oil group versus 6 of 41 (15%) with carriers alone, P = .008 | Four oils together; rosemary's share cannot be separated out |
Read the two together. Panahi shows that a rosemary oil product and a minoxidil 2 percent product produced a similar hair-count change at six months, with no placebo to say how much either exceeded nothing at all. Hay shows a four-oil blend beat carrier oil in a different condition. Neither of them is a study of "rosemary oil makes hair grow." The honest line is the one the trials permit: promising, small, and not yet decisive.
Minoxidil is a drug, and decisions about it belong with a physician or dermatologist. We mention it only because it is the comparator in the one rosemary trial.
The camphor side: what we looked for and did not find
We ran a title search of Europe PMC for camphor with hair, alopecia or scalp. It returned two records. One, a 2022 paper on slowly adapting mechanoreceptors in the rat sinus hair follicle, concerns nerve responses in a rodent whisker follicle. The other is a patent record. Neither is a human hair trial. If a page tells you camphor oil promotes hair growth, it is not drawing on a trial we could find, and we would ask the seller which study they mean.
That is the reason our hair content for camphor is about fragrance and sensation, not outcomes. The sensation is better documented than any hair effect. In a 2014 study of nine adults, camphor in petroleum jelly at 5, 10 and 20 percent produced a cold sensation on the forearm that faded within about 10 minutes and was replaced by a warm one. That tells you what a camphor-scented scalp product might feel like on the skin. It does not tell you anything about hair.
The overlap nobody mentions: rosemary can contain camphor
Here is the point most comparison pages miss. Rosemary oil is not chemically distant from camphor oil, because rosemary itself makes camphor. A study of 71 rosemary leaf oil samples from Algeria found camphor ranging from 0.3 to 31.0 percent and 1,8-cineole from 9.7 to 70.2 percent, with the samples falling into groups defined by those two compounds. Another study of rosemary germplasm described four chemical groups, including a camphor type and a 1,8-cineole type.
The practical consequences follow from the numbers:
- "Rosemary oil" on a shelf can be a camphor-rich oil or a cineole-rich oil, and the label rarely says which.
- The oil in the Panahi trial is not described in the abstract, so no one can say that its effects, whatever they were, came from rosemary's cineole, its camphor, or something else.
- A camphor-rich rosemary oil carries the same kind of cautions you would apply to camphor. That is an inference from composition, not a published finding about rosemary oil, but it is a reason to ask for a GC/MS before using any rosemary oil in a leave-on product.
We do not know the camphor figure for any given bottle of rosemary, and we cannot tell you the composition of our own white camphor fraction, whose certificate lists physical constants and no GC/MS. The Tisserand Institute notes that the white fraction contains very little camphor (up to 9 percent, more typically 3 percent), so the word "camphor" on our bottle is a plant-and-fraction name, not a camphor percentage. See Inside the Still for what we do and do not document.
What a fair test of any scalp oil would need
The gaps in these trials tell you what to look for in the next claim you see, for either oil. This section is reasoning from the two abstracts above, not a published standard.
- A placebo or carrier-only arm. Panahi compared two active products, so it cannot show how either performed against doing nothing. Hay did use carriers alone, which is why its comparison means more.
- A defined oil. Given that rosemary samples ranged from 0.3 to 31.0 percent camphor in one study, a trial that does not report composition cannot be repeated by a buyer. A GC/MS report for the oil used is the minimum.
- Enough time. Neither group in Panahi changed significantly at 3 months. Any promotional claim of a visible change in weeks has no support in that trial.
- Objective measures. Panahi used standardized microphotography and Hay used sequential photographs rated by two dermatologists. Testimonials do not meet that bar.
Apply the same questions to camphor and the answer is short: there is nothing to apply them to. That is not evidence that camphor does nothing. It is evidence that nobody has published a test, which is a different statement, and it is the statement we are willing to make.
Which one belongs on a scalp
This is the part that is our judgment rather than a study result.
| Goal | Our view |
|---|---|
| You want a hair-growth product | Neither oil is something we sell for that. See a dermatologist; the rosemary trials are small |
| You want a scented scalp oil | Either can be scented material, diluted and patch-tested. Rosemary's scent is herbal; the white camphor fraction is dry, woody and cool |
| You want to use a rosemary oil that carries camphor | Ask for the GC/MS first and treat it with camphor-level caution |
| A child will be involved | Neither; camphor is contraindicated for infants and young children on our hazard page |
If the scent of white camphor is what you want in a scalp oil, we sell it in dark amber glass from 0.5 oz to 400 lb, and the shop lists every size. It is an aromatic material. Use the dilution guide and our patch test guide first, since scalp skin is as reactive as any other. For a carrier-based recipe with the limits spelled out, our camphor and coconut oil for hair article covers the arithmetic.
Questions we get asked
Does rosemary oil work better than minoxidil?
The Panahi trial found no significant difference between the two at 6 months, with no placebo arm. That is not the same as "rosemary works as well," and it is not evidence that rosemary works better.
Can camphor oil make hair grow?
We found no human trial that says so. We do not claim it and would not buy from someone who does.
Is it safe to put camphor oil on the scalp?
It is a skin irritant at strength, so any use means dilution and a patch test, and none near children. If your scalp is irritated, stop and ask a clinician.
This article is an evidence review, not medical advice. For hair loss, scalp conditions or any decision about hair loss, consult a dermatologist or physician.
Camphor Essential Oil
Camphor Essential Oil from our own shop, in sizes from 0.5 oz to bulk.
From $8.69
Shop Now →Sources & Further Reading
- Panahi Y et al. Rosemary oil vs minoxidil 2% in androgenetic alopecia: a randomized comparative trial. 2015
- Hay IC et al. Randomized trial of aromatherapy in alopecia areata. Arch Dermatol, 1998
- Bekhechi A et al. Chemical variability of Rosmarinus officinalis leaf essential oil from the Algerian Sahara. 2024
- Sadeh D et al. Interactive effects of genotype, seasonality and extraction method on rosemary essential oil composition. 2019
- Effects of camphor and related compounds on slowly adapting mechanoreceptors in the rat sinus hair follicle. 2022
- Kotaka T et al. Camphor induces cold and warm sensations with increases in skin and muscle blood flow in human. 2014
- Tisserand Institute. Cinnamomum camphora: its many names and chemotypes