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The research

We read the studies.
Honestly.

Every claim here is graded by how strong the evidence actually is — and linked to the source so you can check it yourself. Where the science is thin, we say so.

Four grades. No spin.
ModerateControlled human trialsRepeated studies in people point the same way.
EarlySmall / lab / animalPromising signals, but not yet proven in people.
TraditionalLong-usedCenturies of use; clinical evidence still anecdotal.
NoneNo trials foundWe looked and found none. We won’t pretend otherwise.
T

Tea Tree

Moderate22 studies in our database
In controlled trials a 5% tea-tree gel cut acne lesions about as well as benzoyl peroxide — with less dryness. Eight acne studies make it our best-evidenced oil.
Peppermint

Peppermint

Moderate18 studies in our database
Topical menthol eased tension-type headache and stimulated a tired scalp in small controlled studies.
Headache
A systematic review and a controlled trial give moderate evidence that menthol can ease tension headache.
PubMed →
Hair growth
In a mouse study, 3% peppermint oil grew hair more effectively than minoxidil — striking, but animal-only.
PubMed →
Fungal
Lab studies show peppermint and menthol have antifungal activity.
PubMed →
Skin ageing
A controlled study found peppermint leaf extract improved dermal thickness.
PubMed →
Rosemary

Rosemary

Early21 studies in our database
Long used for hair and scalp. Early studies are promising — one small trial even matched 2% minoxidil for regrowth — but the evidence base is still limited.
Hair & thinning
One pharmaceutical-grade trial compared rosemary to minoxidil — promising, evidence still small.
PubMed →
Dandruff
Superior antifungal action against dandruff-linked microbes in lab studies.
PubMed →
Joints
Rosemary's carnosic acid showed anti-inflammatory activity in animal studies.
PubMed →
Headache
Long used traditionally; clinical evidence still anecdotal.
PubMed →
Argan

Argan

Early18 studies in our database
Rich in vitamin E and traditionally prized for skin. Early studies point to better hydration and elasticity; more research is needed.
Diaper rash
A 140-infant study found argan oil more effective than 1% hydrocortisone for diaper rash.
PubMed →
Dry skin
A lab study showed argan oil improved skin hydration and barrier repair.
PubMed →
Hair & thinning
Lab evidence suggests argan extracts support hair-cell growth and cut oxidative stress.
PubMed →
Skin ageing
A review discusses argan's anti-ageing potential via antioxidant pathways.
PubMed →
V

Vitamin E

Early22 studies in our database
A well-known antioxidant. Topical evidence is still early and mixed — and we grade it that way, honestly.
Jojoba

Jojoba

None
A superb carrier oil with a long traditional history — but, honestly, no clinical trials behind its claims.
We searched our research database and found no clinical trials for jojoba’s effects. It’s an excellent carrier oil — it mirrors skin’s own sebum, which is why it sits so well on oily, breakout-prone skin — and it’s prized in traditional care. But we won’t cite efficacy we don’t have.

Deep dives: read the full evidence per oil — Rosemary · Moroccan Argan · Cold-Press Jojoba · Peppermint.

Study counts reflect our internal research database (235+ studies across the range). Figures are honest tallies, not marketing claims; individual uses link to PubMed.