The best oils for coily hair: why the feel changes in a second

Your ends feel tight by the end of the day, so you open a bottle and warm a few drops between your palms. The feel changes in a second, the strand turns supple again. But what’s left the next day?

That small, repeated disappointment explains most shelves cluttered with half-used bottles. It doesn’t come from your choice of oil, it comes from when you use it. So this article starts from the calendar rather than the ranking: on coily hair, only two moments justify a liquid oil, and the rest of the time it does nothing for you. To place those two moments within a care cycle, our step-by-step tutorial walks through the six steps of the Rituel Texture®.

What an oil really does

A plant oil is a lipid, and nothing more. It doesn’t contain a single drop of water. It slips between the scales of the cuticle, reduces friction between strands, softens the feel of the hair and slows the loss of water already held in the fibre. On coily hair, whose spiral shape multiplies the points of friction, that lubricating work is far from trivial.

So lubricating isn’t hydrating. Water enters the hair during washing, and only during washing. An oil applied to a fibre that’s already dry doesn’t let in what’s missing: it closes the door on an empty room. That’s why the evening’s relief doesn’t survive the night. The hair seemed supple because it glided better, not because it had drunk anything.

That confusion is why hair can stay dry despite a bathroom full of products. We go into it in our article on why coily hair is so often dry.

Penetrate or coat

All oils feel much the same, but once on the hair they behave in one of two ways. Some cross the cuticle and settle in the cortex, the inner part of the fibre. Others stay on the outside and form a film that smooths the scales without ever getting in.

The distinction has a practical consequence. An oil that penetrates limits the swelling of the fibre during shampooing, and with it the protein loss and weakening that follow: its place is before washing. An oil that coats has no business there, since it will simply rinse away; on the other hand, it helps rough ends outside of wash day. The work of Rele and Mohile, published in the Journal of Cosmetic Science in 2003, remains the reference: of the oils compared, only coconut oil significantly reduced protein loss, both before and after washing.

So an oil doesn’t repair damaged hair: it stops it getting more damaged, which isn’t the same promise.

The first moment: before washing

This is the only moment when an oil acts on the fibre rather than on the feel. Applied before shampoo, coconut oil limits the swelling of the hair in contact with water, and it’s the only oil for which this effect is documented. It owes this to lauric acid, a fatty acid whose short, straight chain lets it cross the cuticle.

One peculiarity is worth knowing before you buy, and it’s common: some women don’t tolerate it well. Their hair comes out stiff, dry and brittle after a few uses, the exact opposite of what they wanted. If that happens to you, it isn’t a question of dosage. This oil doesn’t suit you, and the only answer is to switch.

That leaves the question of frequency, and this is where our position has changed. The oil bath, that generous application left on before washing, isn’t a weekly treatment. Repeated, it saturates the fibre, weighs it down for a long time and makes colour fade. We keep it for once or twice a year at most, and to prepare for a wash we prefer Chadian finger detangling, which moves sebum along without adding anything. The details are in our article on the oil bath and how often to do it.

The second moment: the ends, between two routines

The second use is more modest and far more everyday. Three or four days after a full routine, the ends turn rough again, because they’re the oldest and most exposed part of your hair. A drop of light oil warmed between your palms and smoothed over the last five centimetres is enough to restore comfort until the next wash. One drop: not a spoonful, and nothing above the ears.

Three oils suit this well. Jojoba is technically a liquid wax, close in composition to human sebum, which makes it comfortable even on a dry scalp, as a massage. Sweet almond is the most versatile, lovely on tired ends at the end of the week. Macadamia, a little richer, partly penetrates and leaves a dry finish; it’s often the one that works when everything else weighs hair down. Our selection of light oils that nourish without weighing down gives the amounts.

Carapate oil, the Caribbean name for castor oil, stands apart. Dark, thick and recognisable by its smell, it’s handed down in Caribbean families and still goes into many homemade treatments. It coats the fibre in a stubborn film that limits breakage during detangling, a real help for lengths that keep snapping. It doesn’t make hair grow faster, though: the length you gain comes from the breakage you avoid, as our article on castor oil and hair growth explains. Its viscosity calls for one rule: always dilute it, and keep it for the lengths.

Oils at a glance

Avocado oil deserves a word, because it’s the richest on the list and the most often misused. It suits very dry hair when the air turns cold, and it flattens fine hair in a single application. Nor should it be confused with the butter from the same fruit, which is solid and isn’t dosed in the same way at all.

Two criteria matter more than the variety you choose: the quality of the bottle and its freshness. Go for cold-pressed, unrefined oils, kept away from light and bought in small sizes. A rancid oil has a recognisable smell, slightly sharp, and should go straight in the bin.

Where oil no longer belongs

Three situations call for putting the bottle down. The first goes to the very structure of our method, and it deserves to be stated clearly rather than corrected quietly.

For a long time, the usual advice, ours included, made oil the last layer of wash day: you hydrated, then sealed on top with a lipid. That sequence has disappeared from our method. Step 06 of the Rituel Texture® is called Locking in moisture and relies on La Crème Coiffante, applied generously, because a water-based formula combined with cocoa butter helps hold on to the hydration brought by the wash. Oil no longer has a place inside the routine. It goes back to what it was in Caribbean families: a finishing drop on the ends, a few days later.

The second situation is an oily or flaky scalp. There, oil feeds the imbalance instead of calming it, and it’s the one place on the head where it’s frankly counterproductive: see our article on dandruff on coily hair.

The third is a matter of season and texture. When hair is very porous, the air is cold and a drop of oil no longer lasts until the next wash, what you need is a solid lipid, not more oil. Our three best plant butters explain which one to choose and how much to use.

Frequently asked questions

Further reading

Sources

• Rele A. S. and Mohile R. B., “Effect of mineral oil, sunflower oil, and coconut oil on prevention of hair damage”, Journal of Cosmetic Science, vol. 54, no. 2, 2003.