By Niki Galvez, Hairstylist & Trichologist Trainee
If you searched "hair oil for hair growth" hoping to find something that grows your hair faster, I want to save you the spiral I went through. Here's the part I had to learn the hard way, and then again in trichology school: believe me, your hair is growing. We just need to actually retain that length.
Your hair grows from the root at its own steady pace, and no oil speeds that up. What the right oil changes is how much of that new length survives instead of snapping off before you ever see it. So this isn't a list of oils that grow hair. It's the honest version: how to keep the length you're already growing.
Can hair oil actually make your hair grow?
No hair oil makes your hair grow faster, that pace is genetic, around 15 cm (roughly 6 inches) a year.7 The right oil helps you keep that length instead of losing it to the breakage that hides it.
The growth rate reality: about 15 cm a year
Your hair is growing right now, as you read this. Around 85 to 90% of the hair on your head is in its active growth phase, called anagen, and that phase runs for years.7 The pace works out to about 1 cm a month. No oil, serum, or scalp treatment speeds that up.
So why does it feel like your hair is stuck at the same length?
Why it looks like your hair isn't growing
Because it's breaking faster than it's growing. For most people, that's the whole story.
Hair loss and hair breakage are different problems. Hair loss means strands fall from the root, and you'll see a tiny white bulb on the end. Breakage means strands snap somewhere along the length, and the broken end looks frayed or blunt, with no bulb.
Most of the "my hair won't grow" frustration is breakage. Your hair is growing from the root, it's just snapping off at the ends before the length ever shows. And breakage is exactly what the right pre-wash oil can help with.
What's actually happening when your hair won't grow
Most of the length you lose isn't falling from the root. It's breaking along the strand, worn down by protein loss, water stress during washing, and everyday friction and heat. Understanding why hair breaks is the first step to keeping your length.
Protein loss: what quietly costs you length
Your hair is mostly keratin protein, packed into the cortex, the strong middle layer of each strand. Every time you wash, shampoo pulls a little of that protein out. Over weeks and months it adds up, and weaker strands snap.
This is where the number in the title comes in. Rele and Mohile (2003) found that oiling before you wash cuts that protein loss by up to 39%, and coconut oil was the only oil that managed it, beating both mineral oil and sunflower oil.1 Less protein lost per wash means stronger strands, and stronger strands hold on to their length. That 39% is the honest reason coconut-derived lipids sit at the centre of most pre-wash formulas.
Wash day: wet hair is fragile hair
When your hair takes in water, it swells. Then it dries and shrinks back. Every wash puts your strands through that swell-and-shrink cycle, which lifts the cuticle scales and tires the fibre out over time.2,3
Think of the cuticle like roof tiles. Lying flat and smooth, they seal moisture in and your hair looks glossy. Lifted or cracked, from washing, heat, or chemicals, moisture escapes and strands turn dry, brittle, and quick to snap.
A pre-wash oil works by wrapping the strand in a barrier before shampoo and water reach it, so it limits how much water your hair takes in. Less water in means less swelling, which means less cuticle damage every wash.6
Friction and heat: the everyday wear
Then there's the mechanical stuff. Brushing, towel-drying, heat styling, even sleeping on a cotton pillowcase, all of it rubs at the cuticle. A worn cuticle means high porosity: your hair drinks up moisture fast and loses it just as fast, which keeps it dry, brittle, and breaking.9
Left alone, that cycle just keeps going.
The oils that actually help you keep length (and why)
Light oils like coconut lipids slip inside the strand, while heavier oils like argan or mineral oil mostly coat the surface.8,6 That difference is everything when you're choosing an oil for length.
Not all oils work the same way. Some get inside the fibre and reinforce it from within. Others sit on top, which can feel nice but doesn't do much to stop breakage.
| Oil type | How deep it goes | How it works | Best for |
|---|---|---|---|
| Coconut lipids (medium-chain triglycerides) | Deep, 30 to 50 micrometres into the cortex6 | Small, saturated molecules slip through the CMC | Protein protection, strength |
| Avocado oil | About 25 micrometres into the cortex6 | Smaller molecules reach part of the way in | Conditioning and body |
| Squalane | Surface and just below | Behaves like your hair's own sebum, seals moisture | Lightweight moisture |
| Argan oil | 0 to 5 micrometres, barely past the surface6 | Large molecules sit on the cuticle | Surface smoothing only |
| Mineral oil | 0 micrometres, doesn't get in3 | Can't penetrate the fibre at all | Coating, not treatment |
For scale, a single strand is only about 50 to 120 micrometres across, so coconut-derived lipids reach roughly a third to halfway in, while argan and mineral oil stay on the surface.
The difference comes down to molecular size. The short, saturated fatty acids in coconut-derived oils are small enough to slip through the CMC, the lipid-rich "mortar" between the protein "bricks" of your hair. Long, unsaturated fatty acids are too bulky to get in.8
Coconut lipids: what the research actually shows
Coconut oil has the strongest evidence of any hair oil. Rele and Mohile showed it reduces protein loss in both damaged and healthy hair, the only oil to do so next to mineral oil and sunflower oil.1,2 Later imaging confirmed it genuinely penetrates the fibre, while mineral oil just sits on top.3
More recent work from Kim and Ahn (2023) found that MCT oil, the coconut-derived lipid, restored tensile strength by 29% in bleached hair after 21 days, from about 180 to 232 megapascals, with a smoother cuticle under the microscope and measurably less protein lost.4
So coconut-derived lipids aren't just popular. They're the most evidence-backed oil for protecting the hair fibre.
Squalane and peptides: what a single oil can't do
Raw oils are good, but limited. One oil can really only do one or two things.
Squalane behaves like your hair's own natural coating, so it seals in moisture without weight. Peptides, short chains of amino acids, are where it gets interesting: research suggests they help strengthen the fibre and improve elasticity, and the smaller ones reach deep into the cortex while both mid and larger sizes improve breakage resistance in damaged hair.5
You won't find these in a jar of raw coconut oil. They're the reason formulated blends exist, and honestly, part of why I started formulating in the first place.
Popular "growth oils": an honest breakdown
Most popular growth oils either work on the scalp (rosemary, peppermint) or are too heavy to use alone (castor). For keeping length, you want penetrating oils and strengthening actives made for your lengths, not just your scalp.
Rosemary oil: good for your scalp, but your lengths need more
Rosemary oil has become the internet's favourite growth oil, and there's some evidence it may support the scalp. But rosemary is an essential oil that works on the scalp, not on your lengths. If your problem is breakage at the ends, and for most people it is, rosemary alone won't fix it.
Scalp health matters for new growth. Keeping the length you've already grown is a different job.
Castor oil: great for elasticity, hard to wash out on its own
Castor oil is rich in ricinoleic acid and supports hydration and elasticity in the hair fibre. It's genuinely useful. The catch is that raw castor oil is thick, and washing it out usually takes aggressive shampooing, which strips out the very protein you were trying to protect.
In a formulated blend it behaves. On its own, it's messy and works against you for most hair types. If you want the full picture, here's our guide to castor oil for hair.
Coconut oil: the research favourite, with one catch
Coconut oil has the best evidence base of any hair oil: less protein loss, real penetration, better strength.1,2 The catch is practical. Raw kitchen coconut oil goes solid at room temperature, spreads unevenly, and can feel too heavy on fine hair.
That's why refined coconut-derived lipids (caprylic/capric triglyceride) are the more usable choice. Same penetration, lighter feel, easier to work with.
Peppermint oil: the tingle isn't growth
That cooling tingle from peppermint oil feels like something is happening, and it may lift blood flow at the surface for a moment. But a tingle isn't growth. There's no strong evidence that peppermint oil, applied to the hair, leads to meaningful growth in people. It's a nice sensation, not a length strategy.
The pre-wash method: how oil actually keeps your length
The pre-wash method works by wrapping your strands in a protective layer before shampoo strips out moisture and protein, cutting a little wash-day damage every single time.1,6 This is the method that actually keeps length over time.
Step 1: apply to mids and ends (not your scalp)
Mids to ends, not the scalp. Oiling your lengths and oiling your scalp are two different things, and your lengths are where breakage happens. Work 2 to 3 pumps of a pre-wash oil from about ear level down to the tips. Fine hair, start with 2 pumps. Thick or long, go up to 4 or 5. It always depends on how much hair you have.
Step 2: let it soak (1 hour minimum, overnight is better)
This is the soak, and patience is the whole point. The longer the oil sits, the deeper it works its way into the fibre. An hour is the minimum for it to make a real difference. Overnight is better. Want to speed it up? Gentle warmth from a Hot Booster Cap opens the cuticle a little so the oil absorbs deeper and faster, which brings the soak down to about 30 minutes.
Step 3: shampoo your scalp twice, then condition
Shampoo your scalp twice, and let the second wash sit for about two minutes, without scrubbing the ends. The first pass breaks the oil down, the second actually cleans your scalp. Then condition the lengths.
One ritual, once or twice a week. Over time the wash-day damage drops, your strands stay stronger, and you keep more of your length.
What to look for in a hair oil for length
Look for a pre-wash oil built on penetrating coconut lipids, with moisture-sealing squalane and strengthening peptides, not a single raw oil poured into a nice bottle. Here's the short checklist.
Penetrating oils over coating oils
If the first ingredient is mineral oil, dimethicone, or argan oil, the product mostly coats your hair, it doesn't protect the cortex. Look instead for coconut-derived lipids (caprylic/capric triglyceride or fractionated coconut oil) and squalane. Those actually get inside the strand.8,6
Strengthening actives, not just oil
A single oil doesn't strengthen hair the way peptides can. Short-chain peptides bind to keratin and improve breakage resistance.5 Niacinamide helps the fibre hold on to moisture, keeping lengths hydrated. Those actives are the difference between a plain oil and a proper pre-wash treatment.
That's the thinking JUVA's formula was built around: it protects (coconut lipids reduce protein loss during washing), elasticizes (peptides and squalane so strands bend instead of snapping), and conditions (sea buckthorn and niacinamide to hold moisture in the fibre). It's a pre-wash oil treatment for mids to ends, not a scalp oil, not a finishing oil.
One blend vs one oil
Raw coconut oil works, the research proves it. But one oil can only do one or two things. A formulated blend pairs penetrating oils with actives that strengthen, seal, and condition at different depths. Think of it like skincare: you wouldn't use a single product for everything, and your hair is the same.
The honest truth about growth claims
When I started studying trichology, the first thing I had to unlearn was almost everything social media had told me about growth. Every "growth oil" implies your follicles need help making hair. For most people, they don't. The follicles are doing their job just fine.
No oil you put on your hair makes your follicles produce hair faster. Anyone who tells you otherwise is selling you something.7
The real problem was never the speed. It's that hair breaks before you see the length. Fix the breakage, and it looks like your hair suddenly took off. It didn't, you just stopped losing what was already there.
That shift, from growth to retention, changed how I approach hair completely. If you want the fuller version, I wrote about why your hair isn't getting longer and how to fix it.
Your next step: a wash-day routine that keeps every centimetre
Keeping length isn't one product, it's a steady pre-wash routine that protects your strands every wash day, so the damage stops adding up and you finally see the length you've been growing.
Once or twice a week, on your lengths, left to soak, then washed out. Over weeks and months, the smaller protein loss and cuticle damage add up to length you actually get to keep. Consistency matters far more than intensity here.
For the full method, timing, dosing, and how to style afterwards, see our complete hair oiling guide and the hair oiling routine we keep coming back to.
Frequently asked questions about hair oil and growth
Does hair oil actually help hair grow?
Not directly. No oil speeds up your follicles, that's genetic. But the right oil reduces breakage by protecting the fibre during washing, so you keep more of the length you're already growing. It looks like faster growth, but it's really better retention.
Which oil is best for hair growth?
For keeping length, which is what most people mean by growth, coconut-derived lipids have the strongest research behind them. Studies show coconut oil reduces protein loss and penetrates deep into the cortex.1,2 Better still in a blend with peptides and squalane.
How often should I oil my hair for growth?
Once or twice a week as a pre-wash treatment is the sweet spot. Consistency matters more than frequency.
Can oiling my hair too much cause hair loss?
Oiling itself doesn't cause hair loss. Keep the oil on your lengths (mids to ends) rather than the scalp, then shampoo your scalp twice, letting the second wash sit about two minutes, without scrubbing the ends, and condition the lengths after.
Does coconut oil help hair growth?
It doesn't speed up growth, but research shows it reduces protein loss, which means less breakage and more length kept over time.1,2 It's the most studied oil for protecting the fibre. Here's our full breakdown of hair oil benefits.
Is rosemary oil better than coconut oil for growth?
They do different jobs. Rosemary works on the scalp and circulation. Coconut oil works on the fibre and reduces protein loss. If your issue is breakage, and it usually is, coconut-derived oils are more directly useful for keeping length.
Should I oil my scalp or my lengths?
Your lengths. Oiling your hair and oiling your scalp aren't the same thing. Breakage happens along the strand, from mids to ends, and that's where a pre-wash oil does its work. Supporting your scalp is a separate step with different products.
If you want a pre-wash oil made for exactly this, one that pairs cortex-penetrating coconut lipids with peptides, squalane, and niacinamide for your mids and ends, JUVA's hair oil treatment was built for keeping length. If you're curious, consider this your sign to start.
This content is for educational purposes and does not constitute medical advice. If you have concerns about hair loss or scalp conditions, please consult a dermatologist or trichologist.
Sources
- Rele AS, Mohile RB. "Effect of mineral oil, sunflower oil, and coconut oil on prevention of hair damage." Journal of Cosmetic Science. 2003;54(2):175-192. PMID: 12715094
- Rele AS, Mohile RB. "Effect of coconut oil on prevention of hair damage. Part I." Journal of Cosmetic Science. 1999;50:327-339.
- Ruetsch SB, Kamath YK, Rele AS, Mohile RB. "Secondary ion mass spectrometric investigation of penetration of coconut and mineral oils into human hair fibers." Journal of Cosmetic Science. 2001;52(3):169-184. PMID: 11413497
- Kim K-B, Ahn S-Y. "Determination of penetration and protection of fatty acids in bleached hair according to fatty acid chain length and the application to understanding the protective effects of MCT oil and coconut oil." Applied Biological Chemistry. 2023;66:38. DOI: 10.1186/s40691-023-00332-0
- Malinauskyte E, et al. "Penetration of different molecular weight hydrolysed keratins into hair fibres and their effects on the physical properties of textured hair." International Journal of Cosmetic Science. 2021;43(1):26-37. PMID: 32946595
- Lourenco CB, et al. "Impact of Hair Damage on the Penetration Profile of Coconut, Avocado, and Argan Oils into Caucasian Hair Fibers." Cosmetics. 2024;11(2):64. DOI: 10.3390/cosmetics11020064
- Paus R, Cotsarelis G. "The Biology of Hair Follicles." New England Journal of Medicine. 1999;341:491-497. PMID: 10441606
- Evans T, Wortmann F, Sherowski A, et al. "Penetration of oils into hair." 2024. ResearchGate: 381671797.
- Gavazzoni Dias MFR. "Hair Cosmetics: An Overview." International Journal of Trichology. 2015;7(1):2-15. DOI: 10.4103/0974-7753.153450