Hair Oils Explained By A Salon Professional

Hair oil is one of the most misunderstood products in the whole haircare aisle. Most people either avoid it completely because they think it will make their hair greasy, or they buy a bottle, apply it wrong, and give up on the whole category. That is a real shame, because a good hair oil used properly can genuinely transform how your hair looks, feels, and behaves.

We stock a wide range of professional hair oils at Revive, and over the years we have used most of them on real clients. This guide is everything we have learned about what hair oil actually does, how to pick the right one for your hair, and how to apply it so you get the results you are paying for.

What hair oil actually does

Hair oil does three main jobs. It adds moisture and shine to the hair shaft, it coats the cuticle to reduce friction and frizz, and it acts as a protective barrier against heat styling, environmental damage, and UV exposure.

That last point is the one most people miss. Hair oil is not just a finishing product that makes your hair look pretty. It is one of the most effective ways to protect your hair from the stuff that actually damages it day to day. Heat tools, towel drying, brushing, sun exposure, chlorine, hard water, pollution, all of this breaks down the hair cuticle over time. A good hair oil sits on top of the cuticle and takes the hit instead.

Some oils also penetrate the hair shaft itself and deliver nutrients from the inside, but the majority of what you buy as "hair oil" is mostly working on the outside. That is not a bad thing. Surface protection is what makes hair feel soft, look glossy, and resist damage.

Hair oil vs hair serum: what is the difference?

This is one of the most common questions we get in the salon, and it is a fair one because the categories overlap so much.

Hair serums tend to be silicone-based and sit almost entirely on the surface of the hair. They are fantastic for instant shine and frizz control, but they do not penetrate the hair shaft in any meaningful way. Think of them as a styling product.

Hair oils are usually a blend of natural oils (argan, coconut, jojoba, sea buckthorn, etc) and sometimes silicones. The natural oils can penetrate the hair to varying degrees, so they deliver a treatment benefit as well as a cosmetic one. Many modern professional hair oils are blends that give you the best of both worlds.

We stock both, and honestly most people benefit from having one of each. If you want to explore serums specifically, have a look at our hair serum collection. For now, this guide is sticking to oils.

Natural oils vs silicone-based oils: the honest take

There is a lot of noise online about silicones being bad for your hair. The honest answer is that it depends.

Silicone-based oils give that instant, glass-like, mirror-shine finish and they are brilliant for frizz control. The downside is that some silicones (particularly non-water-soluble ones) can build up on the hair over time, making it feel heavy or dull between washes. This is why clarifying shampoos exist.

Natural, plant-based oils like argan, sea buckthorn, and jojoba are lighter on buildup but may not give quite the same immediate shine payoff. They tend to be better for genuine hair health over the long term.

Most of the best professional hair oils are intelligent blends. They combine natural oils for the treatment benefit with a small amount of silicone for the shine and slip. For most people, that is the sweet spot.

How to pick the right hair oil for your hair type

This is where most people go wrong. A hair oil that works brilliantly on thick, coarse hair will weigh fine hair down and leave it looking greasy. An oil that gives fine hair the perfect finish will not even make a dent on thick, dry, or coily hair. Picking for your hair type matters more than picking the trendy bottle.

Fine or flat hair

Look for lightweight formulas specifically marketed as "light" or "fluid". The Wella Professionals Oil Reflections Light Oil is a beautiful option because it gives genuine shine without any weight. The Amika Superfruit Star Lightweight Hair Styling Oil 50ml is another brilliant choice and it is, as the name suggests, noticeably lighter than most oils on the market.

Apply sparingly. One or two drops is plenty. Keep it to the mid-lengths and ends and avoid the roots entirely.

Medium to thick hair

This is the sweet spot where most hair oils perform well. You can use richer formulas without them becoming overwhelming. The Wella Professionals Oil Reflections Oil 100ml is one of our most popular products for this hair type. The milk_shake Incredible Oil 50ml is another brilliant option and it smells absolutely unreal (more on that below).

Thick, coarse, or curly hair

Richer, more intensive oils are your friend here. The Matrix Total Results A Curl Can Dream Hair Oil 150ml is specifically formulated for curls and it delivers properly. The Maria Nila Coils & Curls Oil-In Rich Leave-In Cream 100ml is a hybrid oil-cream that works brilliantly on coils and very dry curl types.

Colour-treated hair

Colour-treated hair has specific needs. It needs moisture to replace what the colouring process has pulled out, shine to make the colour look its best, and protection from the environmental factors that fade colour fastest.

The L'Oreal Professionnel Metal Detox Anti-Deposit Protector Concentrated Oil 50ml is in a category of its own here. It actually protects against the metals in hard water that cause colour to fade or turn brassy, which is something most oils do not address. The Redken Acidic Color Gloss Naked Gloss Oil 100ml is also excellent and specifically designed for coloured hair.

Damaged or over-processed hair

If your hair has been bleached, heat-damaged, or chemically processed, you need an oil that can help rebuild as well as protect. The L'Oreal Professionnel Serie Expert Absolut Repair 10-In-1 Professional Oil 90ml is genuinely one of the most versatile repair oils on the market. It does heat protection, detangling, deep conditioning, and shine in one bottle.

The Matrix Total Results Instacure Build-A-Bond Billion Bond Oil 50ml is brilliant for hair that has been weakened by chemical processes. It works on the bonds inside the hair shaft and actually strengthens the structure.

Hair systems and wigs

This is an area that most haircare guides skip entirely, but it matters to a lot of our clients. A human hair system or wig does not receive the natural oils that your scalp produces, so the hair gradually dries out over time. Applying a small amount of a gentle hair oil regularly is one of the best things you can do to extend the life of your system.

The Amika Water Sign Hydrating Hair Oil 50ml is what I personally use on my own hair system. I apply a small amount before bed and wake up with the hair feeling soft and hydrated. The scent is also incredible, which is a nice bonus. For synthetic hair systems, check the manufacturer's guidance first as some synthetic fibres can react badly to certain oils.

How to apply hair oil properly

When and how you apply your hair oil changes the effect you get from it. The same bottle can be a deep treatment, a styling product, or an overnight mask depending on how you use it.

Pre-wash treatment

This is the most underrated use of hair oil. Applying oil to dry hair before you shampoo creates a protective layer that stops the shampoo from stripping too much moisture. Massage through the lengths, leave for anywhere from 15 minutes to a couple of hours, and shampoo as normal.

This is particularly good for hair that feels dry and brittle after washing. The Affinage Kitoko Hair Treatment Oil 290ml is our personal salon favourite for this use case (more below).

Overnight treatment

This is what I personally do with the Amika Water Sign on my hair system. Apply a small amount through the mid-lengths and ends, sleep on a silk or satin pillowcase if you can, and wake up with noticeably softer, more hydrated hair. Works on natural hair too.

If you try this, use a lightweight oil rather than a heavy one, and stay away from the roots. You do not want to wake up with an oily scalp.

Mid-routine on damp hair

This is the classic use. A few drops of oil worked through towel-dried hair before you blow-dry helps with detangling, provides heat protection, and leaves the hair feeling soft and smooth. This is where most people will apply their oil day to day.

As a finishing product on dry hair

A tiny amount (and we mean tiny, one drop for most hair types) rubbed between the palms and smoothed over the finished style adds shine and tames flyaways. This is where silicone-rich oils and serums really shine, pun intended.

Common hair oil mistakes to avoid

Over the years we have seen every possible hair oil mistake walk through the salon. Here are the ones that come up again and again.

Using too much. This is the single biggest mistake. Hair oil is concentrated. One or two drops is plenty for fine to medium hair. Three or four for thicker hair. If your hair looks greasy after applying, you used too much.

Applying to the roots. Unless you are doing a pre-wash scalp treatment with a specific scalp oil, keep hair oil away from the roots. It belongs on the mid-lengths and ends where the hair is oldest and driest.

Applying to soaking wet hair. Water and oil do not mix. If your hair is dripping, the oil will slide straight off. Towel-dry first, then apply.

Skipping heat protection. Not all hair oils provide heat protection, even though many of them feel like they should. If you are heat styling, check the label. If your oil does not specifically say it provides heat protection, use a dedicated heat protection product as well.

Sticking with the wrong oil. If an oil is not working for you, it does not mean hair oils do not suit your hair. It means that particular oil is not right for your hair type. Try a lighter formula, or a different category, before you write off the whole category.

Our honest favourites at Revive

We stock a wide range of professional hair oils and we have genuinely tried most of them. These are the three we come back to again and again.

Affinage Kitoko Hair Treatment Oil 290ml

The Affinage Kitoko Hair Treatment Oil 290ml has been our personal everyday hair oil for more than six years. It is the one we reach for in the salon when we want a reliable, hardworking oil that performs on every hair type without fuss.

What makes it special is the 290ml size. Most hair oils come in 50ml or 100ml bottles and even with careful use you will get through them. The 290ml Kitoko bottle lasts an astonishingly long time (literally months and months of daily use) which means the price per use is better than almost anything else on the market. It does not sound glamorous but when you actually do the maths on how long the bottle lasts, it is genuinely one of the best value hair oils in the salon.

The formula itself is a nourishing blend that works well on everything from fine colour-treated hair to thick Afro-textured hair, which is unusual for a single product. If you only buy one hair oil this year, make it this one.

milk_shake Incredible Oil 50ml

The milk_shake Incredible Oil 50ml is the one we recommend when somebody tells us they want their hair to smell amazing. All of milk_shake's products have an incredible signature scent, and the Incredible Oil is no exception. It is genuinely one of the best-smelling hair products we have ever stocked.

Beyond the scent, it is a genuinely brilliant oil. Good weight, good shine, strengthens the hair and reduces breakage. If you want the full milk_shake experience but in a smaller pour, the milk_shake Glistening Argan Oil 50ml is also excellent and slightly more focused on shine.

Amika Water Sign Hydrating Hair Oil 50ml

The Amika Water Sign Hydrating Hair Oil 50ml is my personal go-to for overnight hydration, and it is what I use on my own hair system. A small amount applied before bed, and I wake up with soft, hydrated, great-smelling hair. The scent is incredible, similar to the rest of the Amika range, and it absorbs beautifully without leaving a greasy feeling on the pillowcase.

It works just as well on natural hair. Anyone with dry or thirsty hair who wants to wake up with it looking and feeling better than when they went to bed should give this one a try.

Our hair oil picks for specific needs

Quick reference if you know exactly what you are looking for.

For frizz control: Redken Frizz Dismiss Instant Deflate Oil-In-Serum 125ml, Schwarzkopf Professional Bonacure Frizz Away Smoothing Oil 50ml, or the Wunderbar Vegan Smooth 'n Soft Magic Treat Oil 100ml if you want a vegan option.

For glass-like shine: Wella Professionals Oil Reflections Oil 100ml, Wunderbar Vegan Gloss-it Top Coat Oil 100ml, or the Osmo Glass Fluid Luxe Elixir 50ml.

For dry or damaged hair: Amika Glass Action Universal Elixir 50ml, L'Oreal Professionnel Absolut Repair 10-In-1 Oil 90ml, or the Matrix Food For Soft Multi-Use Hair Oil Serum 50ml.

For blondes specifically: The Joico Blonde Life Brilliant Glow Brightening Oil 7.4ml is a brilliant little bottle for adding brightness to blonde hair without over-toning.

For argan oil specifically: Maria Nila True Soft Argan Oil or the milk_shake Glistening Argan Oil 50ml.

For curls: Matrix Total Results A Curl Can Dream Hair Oil 150ml or the Maria Nila Coils & Curls Oil-In Leave-In Cream 100ml.

For colour protection: L'Oreal Professionnel Metal Detox Concentrated Oil 50ml.

For hair systems and wigs: Amika Water Sign Hydrating Hair Oil 50ml or the Affinage Kitoko Hair Treatment Oil 290ml.

Frequently asked questions

How often should I use hair oil?

Most people benefit from using a small amount of hair oil every time they style their hair, so daily or every other day if you style that often. For deeper treatments (pre-wash or overnight), once or twice a week is plenty.

Can hair oil cause hair loss?

Hair oil applied to the lengths and ends cannot cause hair loss. If you apply heavy oils to the scalp and leave them on long term, the buildup can potentially contribute to scalp issues that might affect hair growth, but this is rare and easily avoided with proper washing.

Can I use hair oil on wet hair?

Towel-dried, damp hair is ideal. Soaking wet hair will cause the oil to slide off without absorbing. Dry hair works well for finishing.

Is hair oil good for hair growth?

Hair oils that are specifically formulated as scalp treatments (such as rosemary or castor oil products) may support a healthier scalp environment, which can indirectly support growth. Standard hair oils applied to the lengths do not affect growth directly, but they do reduce breakage, which means you retain more length over time.

What is the best hair oil for fine hair?

Lightweight, fluid formulas work best. The Wella Professionals Oil Reflections Light Oil and the Amika Superfruit Star Lightweight Hair Styling Oil are both excellent choices. Apply sparingly to the mid-lengths and ends only.

Can I use hair oil as a heat protectant?

Some hair oils provide heat protection and some do not. Check the label. If it does not explicitly mention heat protection, use a dedicated heat protection product in addition to your oil.

How much hair oil should I use?

Start with one or two drops for fine to medium hair, three or four for thicker hair. You can always add more. You cannot take it back once it is in.

Ready to find your perfect hair oil?

Explore our full hair oil collection or drop in to the salon at 6 Station Road, Codsall and have a chat with us about what would work best for your hair. We stock all the brands mentioned in this guide and more, including Moroccanoil, Affinage, Amika, and Olaplex.

Free UK delivery on all orders from Revive Hair Artists in Codsall.