Squalane, Explained: What It Does and Why It's on Every Label

Squalane is an emollient — a lipid that sits between skin cells, fills the gaps and makes skin feel smooth. Its distinguishing feature is that it is nearly identical to something your skin already produces, which is why it absorbs without the greasiness most oils leave and why it suits almost every skin type including oily.

It is also one of the most common ingredients in modern skincare, appearing in moisturizers, serums, cleansing oils and sunscreens, and it is the carrier in several products we rank — including The Ordinary's retinol, which suspends the active in squalane precisely because it is inert and stable.

Squalene versus squalane — the letter that matters

Squalene(with an "e") is produced by your own sebaceous glands and makes up roughly 10–12% of skin surface lipids. It is a natural component of sebum and part of what keeps the surface flexible. It is also chemically unsaturated, which means it oxidizes readily — it goes off, and oxidized squalene on skin has been associated with comedone formation.

Squalane(with an "a") is squalene that has been hydrogenated: the unstable double bonds are saturated, producing a molecule that is chemically stable, does not oxidize easily, and has a long shelf life. This is why cosmetics use squalane and not squalene. Same shape, same feel, no rancidity problem.

Where it comes from

Historically, shark liver — which is why the ingredient carried an ethical problem for years and why some brands still specify their source prominently. Today the two dominant plant sources are:

Olives. Derived from olive oil. Well established, slightly variable in purity depending on the refining, and occasionally carrying a faint scent.
Sugarcane. Produced by fermentation, giving a very high-purity, odorless result with a consistent supply. This is the source most of the large modern skincare brands use.

Functionally there is little to choose between well-refined versions of either. If the source matters to you ethically, look for "100% plant-derived" or an explicitly named source — the INCI name is simply "squalane" and does not tell you where it came from.

What it actually does

Claim	Honest assessment
Softens and smooths skin	Yes. This is the core, well-established emollient function.
Reduces water loss	Yes, modestly. It is a light occlusive — far weaker than petrolatum, which is part of its appeal.
Non-comedogenic	Generally, yes. It is one of the few facial oils widely tolerated by breakout-prone skin, though no oil is universally safe.
Antioxidant	Overstated. Squalene has some antioxidant activity; the saturated squalane version has much less. Do not buy it for this.
Anti-aging	No direct evidence. It improves how skin looks by hydrating and smoothing, which is not the same as changing its structure.

Why oily skin can use it

The usual objection to facial oils is that they feel heavy and sit on the surface. Squalane is unusually light and absorbs quickly because it matches the lipid profile skin already has. It is also non-fragrant and has one of the shortest possible ingredient stories — a bottle of pure squalane is one ingredient.

That said, "generally non-comedogenic" is not a guarantee. Some people do break out from it, comedogenicity ratings are derived from old rabbit-ear testing that translates poorly to human faces, and the only reliable test is your own skin over a few weeks. If you are breakout-prone, patch it on one area first.

How to use it

Squalane is an oil, so it goes near the end of a routine — after your water-based serums and, if you use both, generally after or mixed into your moisturizer. The thinnest-to-thickest rule puts it late for the same reason it puts every oil late: applied first, it blocks the lighter layers underneath.

Three practical uses that genuinely work:

A few drops over moisturizer at night when skin is dry. Adds slip and a light seal without the weight of a balm.
Mixed into a moisturizer that is not quite rich enough, rather than buying a second, heavier cream.
As a buffer under a retinoid. A thin layer before or after the active reduces irritation without much reducing efficacy — one of the more useful tricks for getting through the adjustment period described in our retinol guide.

It is also a reasonable first-step cleansing oil — massaged in dry to dissolve sunscreen, then followed by your normal cleanser. That is one of the few genuinely sound DIY moves, and it is on the short safe list in our DIY skincare guide.

What it does not replace

Squalane is an emollient and only an emollient. It supplies no water, so on dehydrated skin it will feel nice and change nothing — you need a humectant like hyaluronic acid or glycerin underneath it. It supplies no barrier lipids of the type a compromised barrier is actually missing, so it is not a substitute for ceramides. And it is not an active: it will not change pigmentation, texture or fine lines.

Think of it as the finishing layer that makes everything underneath feel better, not as a treatment. Judged that way it is genuinely excellent and very hard to get wrong — which is exactly why it appears on so many labels.

How we picked

We did not lab-test this gear

Everyone in this category says they tested twenty products. We have not lab-tested any of these, and we say so. What we did instead: compiled the published specifications, decoded the ingredient (INCI) lists active by active, ran the math where there was math to run, and scored each product against a published rubric. The scores are judgments from documented research — not measurements we took, because we do not have a lab and we will not pretend we do. Where a number came from someone else's work, we name them in Sources.

Questions

Frequently asked

What does squalane do for your skin?

It is an emollient — it fills the space between skin cells, so skin feels smooth and soft, and it forms a light seal that modestly reduces water loss. Because it closely mimics a lipid your skin already produces, it absorbs quickly without a greasy finish.

What is the difference between squalene and squalane?

Squalene is the unsaturated lipid your own sebaceous glands produce; it oxidizes easily, which is why it is not used in cosmetics. Squalane is the hydrogenated, saturated version — chemically stable, long shelf life, and functionally the same on skin.

Is squalane good for oily or acne-prone skin?

Usually yes. It is lighter and absorbs faster than most facial oils and is generally considered non-comedogenic, which makes it one of the few oils breakout-prone skin tolerates. It is not a guarantee, so patch it on one area for a couple of weeks first.

Is squalane made from sharks?

It used to be, and some cheap sources still are. The two dominant modern sources are olives and sugarcane, and sugarcane-derived squalane is what most large brands use. Look for '100% plant-derived' or a named source — the INCI name alone does not tell you.

When do I apply squalane in my routine?

Near the end, after water-based serums and generally with or after your moisturizer. It is an oil, so applying it early blocks the lighter layers underneath. A few drops over moisturizer at night is the most common and most useful way to use it.

Keep reading

Receipts

Sources

We do not run a testing lab, and we do not pretend to. Where a measured number came from someone else's work, we name them and link them. Where we could not verify something, we say so on the page rather than quietly leaving it out. Read our full method.