Rosemary Hair & Scalp Strengthening Oil
with Hemp Seed, Rosemary & Organic Argan
The fifteen minutes before shampooing that change everything after.
Best for: scalp nourishment, hair resilience, and restoring shine to dry or thinning hair
€60
Freshly made to your order in our COSMOS-certified European laboratories
COSMOS NATURAL · 100% NATURAL ORIGIN · 69% ORGANIC · GLUTEN-FREE · VEGAN · CRUELTY-FREE
Rosemary Hair & Scalp Strengthening Oil is a COSMOS Natural certified pre-shampoo treatment blending ten oils — seven organic — with rosemary and peppermint to support scalp microcirculation and nourish weak, thinning, or dry hair. Apply before shampooing, leave for fifteen minutes, then wash as normal. 100% natural origin · 69% organic · 30ml · €60.
From Clare
Clare Devereux IAT · Advanced Clinical Trichologist · Harley Street London & Dublin
This is the product that works underneath everything else. Before the shampoo, before the conditioner, before any styling — the oil goes on first, and it changes what happens after.
It’s a blend of ten oils, seven of them organic. Organic hemp seed, organic castor, organic sweet almond, organic argan, organic olive, organic avocado, and organic sunflower — each chosen for a different molecular weight and penetration profile, so together they nourish at every level of the hair shaft and scalp. Rosemary leaf oil has been the subject of clinical research for its role in supporting hair growth, and alongside peppermint oil it stimulates microcirculation at the scalp — helping to create the conditions for stronger, healthier hair. And organic nettle leaf extract — a traditional hair-strengthening botanical — ties the formula together.
In my practice in Dublin and London, this is the Essential I recommend for anyone concerned about thinning, weakness, or hair that’s lost its resilience. It’s in four of our seven Edits because it addresses what most people overlook — the scalp. Healthy hair starts with a nourished scalp, and fifteen minutes with this oil before shampooing does more for your long-term hair health than any amount of product applied after. 100% natural origin. 69% organic. 30ml lasts eight to twelve weeks at weekly use.
This is for you if
- Your hair feels weak, thin, or lacking resilience
- You want to support healthy hair growth from the scalp
- Your hair has lost its natural shine or feels dry and brittle
- You’re experiencing shedding or thinning and want to nourish the foundation
- You want a weekly scalp treatment that complements your daily routine
- You prefer genuinely natural products — this is 100% natural origin, 69% organic
Consider instead if
- You want a lightweight daily finishing product rather than a weekly pre-shampoo treatment — our Shine Leave-In Hair Mist delivers shine and protection without the 15-minute commitment
- Your hair needs deep structural repair rather than scalp nourishment — our Intensive Rescue Hair Mask rebuilds weakened hair from within
- Your scalp is currently irritated or reactive — start with the Sensitive Scalp Shampoo to calm things first, then add the oil once your scalp has settled
- You want to clear buildup before nourishing — our Deep Cleanse Scalp Scrub resets the foundation, then the oil nourishes what’s underneath
What’s Inside
Ten oils, seven organic. Every ingredient is a natural oil or plant extract — no water, no fillers, no synthetics. This is as close to the plant as a formula can get.
Hemp Seed Oil
CANNABIS SATIVA · ORGANIC
Rich in omega-3 and omega-6 fatty acids in an unusually balanced ratio. Penetrates the hair shaft without heaviness, delivering deep nourishment to dry, brittle hair while helping to balance sebum production on the scalp. The ingredient nobody expects in a hair oil — and the one that makes people ask what you’re using.
Rosemary
ROSMARINUS OFFICINALIS · ORGANIC
The ingredient this oil is built around. Rosemary leaf oil has been used for centuries in traditional hair care and has gained significant attention for its role in supporting microcirculation at the scalp. Better circulation means hair follicles receive more of the nutrients and oxygen they need. The long-term investment in your hair’s future.
Organic Argan Oil
ARGANIA SPINOSA · ORGANIC
At INCI position #5, argan is one of the most concentrated oils in this formula. Rich in vitamin E, ferulic acid, and essential fatty acids. Strengthens hair elasticity, reduces brittleness, and adds a natural lustre that doesn’t look oily or artificial. The luxury oil that genuinely earns its reputation.
Peppermint
MENTHA PIPERITA · ORGANIC
The ingredient you feel working. Peppermint oil creates a cooling, tingling sensation on the scalp that signals increased blood flow. Alongside rosemary, it supports the microcirculation that keeps hair follicles nourished and active. It also provides the invigorating freshness that makes this oil feel like a treatment, not just a product.
Helianthus Annuus (Sunflower) Seed Oil*, Decyl Cocoate, Ricinus Communis (Castor) Seed Oil*, Prunus Amygdalus Dulcis (Sweet Almond) Oil*, Argania Spinosa (Argan) Kernel Oil*, Parfum/Fragrance, Cannabis Sativa (Hemp) Seed Oil*, Olea Europaea (Olive) Fruit Oil*, Persea Gratissima (Avocado) Oil*, Mentha Piperita (Peppermint) Oil*, Rosmarinus Officinalis (Rosemary) Leaf Oil*, Urtica Dioica (Nettle) Leaf Extract*, Menthol**, Limonene**, Camphor**, Pinene**, Citrus Aurantium Bergamia Peel Oil, Linalool**, Beta-Caryophyllene**, Vanillin, Linalyl Acetate**, Eugenia Caryophyllus Oil, Eugenol**, Citrus Aurantium Peel Oil, Citrus Limon Peel Oil, Pogostemon Cablin Oil, Santalol**, Coumarin, Carvone**. (*Ingredients from organic farming. **Made using organic ingredients.)
Your Ritual
Apply to dry hair and scalp before shampooing. Part your hair into sections and use the dropper to apply the oil directly to the scalp. Massage gently with your fingertips for one to two minutes — you’ll feel the peppermint tingle as circulation increases. Then work any remaining oil through the mid-lengths and ends.
Leave for a minimum of fifteen minutes. Longer is better — some clients apply it an hour before washing, others leave it overnight with a towel on the pillow. The oils need time to penetrate, and the rosemary and peppermint need time to do their work at the scalp.
Then shampoo as normal. One wash is usually enough to remove the oil completely — the formula is designed to rinse clean without leaving residue. Follow with your conditioner, or swap in the Intensive Rescue Hair Mask for a combined deep-treatment day.
Use once a week. The 30ml bottle uses a dropper, not a pour, so each application uses only a small amount. Most clients get eight to twelve weeks from a single bottle.
The Experience
Gourmand warmth with the freshness of peppermint and rosemary cutting through — aromatic and herbal, with a vanilla and tonka bean undertone that grounds it into something rich rather than medicinal. The peppermint tingle on the scalp makes fifteen minutes feel like a spa treatment. This is the product that makes your bathroom smell like a place you chose to be.
Use Before Any Routine
This oil is a pre-shampoo treatment — it goes on first, before your shampoo and conditioner. It works with every HHE routine because it addresses the scalp foundation that every routine builds on.
Follow with your Routine
Moisturising Shampoo & Conditioner
Apply oil, leave 15 minutes, then wash with Moisturising Shampoo and condition as normal. The most recommended combination for everyday hair that needs deeper weekly nourishment.
Volume Boost Shampoo & Conditioner
For maximum scalp stimulation. The oil's rosemary and peppermint paired with the Volume Boost duo's chanterelle and caffeine — a double approach to supporting fuller, stronger hair.
Sensitive Scalp Shampoo
For sensitive scalps that are ready for nourishment. Once your scalp has settled with the Sensitive Scalp Shampoo, the oil deepens the recovery with gentle weekly nourishment.
Enhance with Essentials
Shine Leave-In Hair Mist
After washing out the oil, a light mist on towel-dried hair seals everything in and adds daily protection between treatments. The finishing step that extends the oil's work.
Intensive Rescue Hair Mask
On oil treatment days, swap your conditioner for the Intensive Rescue Hair Mask. Oil before shampooing, mask after — double the deep nourishment in one session.
This product features in
An Edit is a curated combination of products selected by Clare for a specific situation — everything you need to start, in one step.
The Scalp Recovery Edit
For anyone whose scalp needs focused attention — irritation, sensitivity, flaking, or discomfort. Clare's starting protocol for restoring calm and creating the conditions for healthy hair growth.
Sensitive Scalp Shampoo · Fresh Conditioner · Deep Cleanse Scalp Scrub · Rosemary Strength Oil
The GLP-1 Hair Support Edit
For anyone experiencing hair changes alongside GLP-1 medication. Gentle daily nourishment combined with the Essentials that support hair during the shedding phase and beyond.
Moisturising Shampoo · Moisturising Conditioner · Rosemary Strength Oil · Shine Leave-In Hair Mist
Key Takeaways
COSMOS Natural certified — 100% natural origin, 69% organic, ten oils with seven organic.
Rosemary and peppermint oil support scalp microcirculation, helping to create conditions for stronger hair growth.
A pre-shampoo treatment — apply to dry hair and scalp, leave for fifteen minutes, then wash as normal.
Most clients notice visible improvement in hair resilience and reduced shedding after four to six weeks of weekly use.
FAQ
Apply to dry hair and scalp before shampooing. Part your hair into sections and use the dropper to apply directly to the scalp. Massage for one to two minutes, then work remaining oil through mid-lengths and ends. Leave for a minimum of fifteen minutes — longer is better. Then shampoo as normal.
Once a week for most clients. Some use it every wash day for the first four to six weeks to build the initial effect, then reduce to weekly maintenance. The 30ml bottle uses a dropper, so each application requires only a small amount — most clients get eight to twelve weeks from a single bottle.
Rosemary oil has been the subject of clinical research for its role in supporting hair growth. A 2015 randomised comparative trial published in SKINmed found that rosemary oil showed improvement in hair count over six months. However, results depend on the type and cause of hair loss. This oil supports scalp health and microcirculation — it is not a medical treatment for hair loss conditions.
No — the formula is designed as a pre-shampoo treatment that rinses clean with one wash. The oils penetrate during the treatment time and are then removed by shampooing. Your hair should feel nourished and strengthened after washing, not oily or heavy.
Yes. The Rosemary Hair and Scalp Strengthening Oil is COSMOS Natural certified by ECOCERT Greenlife. It is 100% natural origin and 69% organic — the highest organic percentage in the Hair Health Essentials range. Every ingredient is a natural oil or plant extract.
If your scalp is currently reactive or uncomfortable, start with the Sensitive Scalp Shampoo to calm things first. Once your scalp has settled, the Rosemary Strengthening Oil can be introduced gently. The peppermint oil creates a tingling sensation — on a healthy scalp this is stimulating, but on an irritated scalp it may cause discomfort. Let your scalp guide the timing.
What our clients say
Fifteen minutes that change weeks.
Add the Rosemary Strength Oil to your weekly routine as a pre-shampoo treatment. One application per week. Eight to twelve weeks per bottle. Visible results in four to six weeks.
Not sure which products are right for you?
for Clare’s personalised guidance.
This is the product clients are most consistent with. It becomes a ritual — the fifteen minutes before shampooing that they look forward to. Some use it every wash day. Others save it for once a week. The oil adapts to your schedule, and the cumulative effect builds with each application. Four to six weeks of weekly use is when most clients notice the real difference — stronger roots, less shedding, hair that genuinely feels more resilient.
· COSMOS-certified laboratory · 19 years of expertise
CERTIFICATION
ECOCERT Greenlife · COSMOS Natural Standard
FORMULATION
100% Natural Origin · 69% Organic · Silicone Free
SUITABLE FOR
All Hair Types · Thinning Hair · Dry Scalp · Pre-Shampoo
MANUFACTURED
EU · COSMOS-certified facility · Freshly produced to order
SUSTAINABILITY
Recyclable packaging · No GMO · Biodiversity-respecting ingredients
VOLUME
30ml / 1.01 fl oz
<em>This product is for general scalp and hair care and does not constitute medical treatment. If you are experiencing significant hair loss, shedding, or scalp concerns, please consult a qualified trichologist or GP.</em>