Hair oil is the Bose of the hair world. Each blend is expertly crafted and fine-tuned to improve volume, shine and smooth even the frizziest hair into submission.

There are just two things you need to navigate when choosing one.

Namely, the right oils for your hair type. Those that add back much needed moisture to thick or Afro hair, for example, will reduce fine hair to an oil slick.

‘Olive, argan and coconut oils, which are typically used on Afro hair, can be too heavy for finer, Caucasian hair,’ explains hairdresser Paul Windle, founder of Windle London. All are, however, key for tight curls, which absorb damaging chemicals more rapidly than straight hair.

Also consider what you need the oil to do for your hair.

Some are packed with essential vitamins that are applied to the scalp and hug each cuticle to jumpstart healthy hair growth.

Other carrier oils like carrot or jojoba improve shine. Meanwhile argan oil, which is rich in fatty acids and vitamin E, breathes life back into thick, brittle strands.

How Do Hair Oils Work?

What’s going on behind the scenes goes something like this. Fatty acids and antioxidants within the oil add a protective layer to your hair, helping to prevent breakage.

‘It’s hard for the natural oil on your scalp to travel and moisturise the ends,’ says Nicola Clarke, Creative Colour Director at John Frieda, whose clients include Cate Blanchette.

‘A hair oil will replenish the lipid layer on the surface of the hair. It will also penetrate deep into the strand to strengthen weak spots and prevent damage.’

The Best Hair Oil For Fine Hair

Generally speaking, if you have very fine hair and are worried about slopping it down apply the oil 20 minutes before washing your hair.

‘Massage into the hair and wrap your hair in a warm towel,’ says Windle, who swears by a pre-cleanse blend of featherlight apricot, camellia and oat oils. ‘When you shampoo, it will take away the residue the oil leaves behind but none of the goodness.’

If your hair gets easily greasy, avoid using oils close to the roots. A tiny dollop applied evenly through the ends of your hair should be enough to improve texture without the extra weight.

One beauty-editor approved oil that doesn’t involve any heavy schmearing is the Virtue Healing Oil.

Virtue Healing Oil, £40, Net-A-Porter

All Virtue products contain the Alpha Keratin 60ku protein, a sciencey term for the first-ever keratin molecule extracted from real human hair.  The hair oil’s ‘shake to activate’ formula means the keratin lives inside the bottle without being diluted in the melon oil. So you get a fresh dose of this strand-repairing protein each time.

Best Hair Oil For Dry Hair

If your hair happens to be thick or prone to frizz, rub a pea-size amount of oil between your palms. Work it over the bottom of wet strands to sleeken your pony.

Alternatively, apply it as an intensive overnight treatment. Simply let the oil trickle from root to tip, massage it in and tie your hair up to avoid contact with the face.

Ouai Hair Oil, £24, Lookfantastic

This hair oil from Jen Atkin, hair stylist to the Kardashian Klan, smoothes the hell out of frizzy, dry hair. Its frontline response is a cocktail of nourishing tamarind seed, keratin, borage and baobab oils to seal ends, ramp up shine and protect against sun damage.

Best Hair Oil For Growth

No magic oil will give you waist-skimming Rapunzel-like strands overnight. But a healthy scalp can improve the quality of your hair growth.

‘Your scalp has the same environment as your face,’ says aesthetic doctor Dr Barbara Sturm.

‘It needs to stay balanced otherwise pores get clogged and the hair cycle gets disrupted. Using a serum that improves the condition of the scalp plays a vital part in the production of strong, healthy hair.’

Some oils have the added benefit of encouraging blood circulation near the scalp, which activates the hair follicles.

Castor oil for hair is one such oil and is especially rich in fatty omega 6. You can find it in Monpure Follicle Boost Hair Density Serum, a new British brand with impressive high-tech natural ingredients.

Monpure Follicle Boost Hair Density Serum, £96

Castor oil helps activate hair follicles by increasing blood flow to the scalp. Additionally, exfoliating retinol and lactic acid work to remove dead skin, which often inhibits hair growth. It also contains a special pumpkin seed extract, which research shows can help block an enzyme responsible for hair loss. Pretty impressive, no?