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Hair oil might seem like a hot new beauty trend, but this is down to marketing.
In reality, they’re nothing new, with humans having used natural seed and plant oils to nourish their locks since ancient times.
The Ancient Greeks would treat their hair with olive oil to keep it shiny, and coconut oil for hair has been a thing across the southern hemisphere for thousands of years.1
If you could see the anatomy of a strand of hair up close, it will seem to be obvious why hair oils are a good idea.
A strand of hair has hundreds of overlapping cuticles. Think of them like roof tiles, all pointing downwards. To stay smooth, these cuticles must all stay uniform and overlapping.
Heat damage, rough handling and too much sun can all roughen up the hair’s cuticles, causing them to become uneven.
Split ends, as you probably know, occur when the hair strand splits from the bottom and the split makes its way up the length of the hair strand.
This is where hair oils come in. They can seal fraying ends and fill the gap between damaged hair cuticles, lubricating the hair strand and preventing further damage.
Think of hair oils as grouting for the tiny invisible cracks on each of your hair strands!
Hair oils and hair serums are very similar and often contain many of the same ingredients.
However, whereas hair oils are primarily used to nourish and improve the condition of your hair, hair serums are often silicone-based and have a more specific styling focus such as taming frizz caused by the weather.
Here are a few of the best hair oils around, plus their benefits for your locks.
The hugely popular argan oil is native to Morocco (and aka Moroccan hair oil).
It’s mostly made of fatty acids which explain why it’s so nourishing to hair strands.2
We like Miaflora Argan Oil which contains 100% cold-pressed argan oil, meaning none of the moisturising properties are lost in its manufacture.
Pour a little oil in a container of hot (not boiling) water until the oil is warm.
After shampooing, massage the oil into the hair and scalp.
Cover with a warm, moist towel for 3-5 minutes.
Rinse with warm water.
This oil comes from the pressed seeds of the nigella sativa plant.3
Black seed oil for hair and body offers softening and nourishing properties. It’s great for softening all hair types, as well as used diluted on the scalp to help fight flakiness.
A favourite pre-shampoo treatment, as well as a way to seal in moisture on damp afro hair types.
Due to its high saturated fat content, coconut oil is heavy and can make finer hair feel greasy if too much is applied.
A product like Fushi Really Good Hair Oil contains a blend of coconut, argan and avocado oil which will nourish all hair types, without weighing it down.
When dandruff is caused by a dry scalp, coconut oil is an excellent choice due to its moisturising properties.4
Coconut oil is rich in medium-chain fatty acids, vitamins and minerals, and can be used on hair damaged hair due to excessive styling or bleaching.
How much coconut oil you should use depends on your goals.
Some people rub a little coconut oil in their scalp before bed and leave it in overnight before washing it off.
Others use coconut oil as a hair mask. That means leaving it in for a few hours and then rinsing later.
You can also rub a bit into your usual shampoo or conditioner. Just remember, a little goes a long way.
It’s important to remember that everyone’s hair is different.
As a word of advice, using too much coconut oil can sometimes have the opposite and clog your hair follicles or give your hair a greasy appearance.
Coconut oil may not be suitable if your scalp is sensitive or if your hair is very coarse. Test a little on an inconspicuous part of your scalp to see if it works for you.
Hemp seed oil has been extracted from hemp seeds, unlike CBD which is extracted from the leaves.
The oil is packed with essential fatty acids Omega 3, 6 and 9 – all important for naturally moisturising and restoring healthy-looking hair.
The high content of fatty acids helps healthy hair growth, as well as Vitamin A, which can help to moisturise the scalp and keep hair healthy.
Not only is hemp seed oil rich in Omega 3,6 and 9 - it's also packed with vitamins D, E and magnesium which help with new hair growth.
It can also help blood circulation which also results in stronger, healthier and longer hair.
The wonder oil can help to soothe itchiness and dryness on the scalp and deter dandruff from forming.
This oil is renowned for its ultra-moisturising properties.5
Derived from the seeds of the jojoba plant, you can smooth out frazzled hair cuticles and add shine with just a few drops of jojoba oil for hair.
Handpicked content: What's great about jojoba oil?
Sourced from the castor bean, an inedible bean made up of fatty acids including omega-6 and ricinoleic acid.6
Using castor oil for hair is used all over the world.
Castor oil's moisturising properties may help to reduce the appearance of split ends.
Most oils and serums can be used on damp hair.
Oils will help to fill in the gaps in any rough cuticles on your hair strand, as well as sealing the moisture in as your hair dries.
Many oils and serums can also be used on dry hair. You should avoid applying heavy oil (like castor oil) or serum to the roots of your hair – only the lengths and ends.
Applying heavy products to the roots will leave you with product build-up on your scalp and oily roots.
Using a hair oil before shampooing might seem pointless, but by penetrating the hair and reducing the amount of water your strands absorb during washing, the oil helps your hair stay stronger over time.
This is because the oil coating the hair results in lower hygral fatigue (repeated swelling and drying), a factor that can damage hair.7
Most serums have an in-built heat protectant which may help to shield your hair from the damaging effects of high heat up to around 240 degrees Centigrade.
Handpicked content: How to get wavy hair without heat
A word of warning. If you’re using oil as a heat protectant, you should be aware that natural oils can have a low smoke point and they burn when exposed to a heat higher than this smoke point.
Coconut oil has a smoke point of 177 degrees Centigrade, so ensure your heat styling tool is set to low.7
Last updated: 23 September 2021
Joined Holland & Barrett: May 2019
BSc Hons in Pharmaceutical & Cosmetic Science
Manisha started her career at a Cosmetics distributor as a Regulatory Technologist followed by a Regulatory Affairs Officer, ensuring the regulatory compliance of cosmetic products from colour cosmetics to skincare.
After 3 and half years in this role, Manisha joined Holland & Barrett as a Senior Regulatory Affairs Associate in 2019.
Manisha specialises in Cosmetic products, both own-label and branded lines, ensuring that these products and all relating marketing material comply to the EU Cosmetics Regulation.