Key Takeaways

• Squalene is an oil-like compound that a 2025 paper in Molecules calls “a major component of human sebum.”

• The same paper calls Squalane “a hydrogenated derivative of squalene” and describes it as “highly resistant to oxidative degradation.”

• Squalene has traditionally been extracted from shark liver oil, and olive oil is the main plant source, according to a 2025 study in ACS Omega.

• On an ingredient list, the spelling tells you which one a formula uses: The “a” is Squalane, the “e” is Squalene.

Squalane and Squalene Are One Letter Apart

The two names differ by a single letter, and they’re closely related chemically. Squalene comes first. Your skin makes it as part of sebum, the oily film at the surface, and plants and animals produce it too.

Squalane is the hydrogenated, or fully saturated, form of Squalene. Hydrogenation adds hydrogen to the molecule, and that difference changes how the ingredient behaves on a shelf, which is the main reason the two are worth telling apart.

Why Stability Separates Them

A 2025 paper in Molecules describes Squalene as “an unsaturated hydrocarbon with six double bonds.” It goes on to say that Squalene’s “high susceptibility to oxidation severely limits its stability, compromising both its efficacy and the shelf life of the formulations in which it is included.”

Squalane, in the same paper’s words, is “a hydrogenated derivative of squalene” that “addresses the limitations of squalene by being fully saturated, rendering it highly resistant to oxidative degradation.” Put simply, Squalene reacts with air more readily, and Squalane holds up longer in a jar.

Both sit among the oil-loving ingredients in a formula. Squalane also turns up in the ingredient lists of some richer creams, as this roundup of Ceramide moisturizers shows.

Where Squalene and Squalane Come From

A 2025 study in ACS Omega reports that Squalene “has traditionally been extracted from shark liver oil,” a practice it says raises “conservation concerns due to declining shark populations.” The same study names olive oil as “the main plant source” and describes olive pomace, a by-product of olive oil production, as an emerging alternative.

It also describes a route that starts with sugarcane: a compound made by fermenting sugarcane with modified yeast is converted into Squalane through dimerization and hydrogenation. So a label reading Squalane doesn’t, on its own, tell you whether the starting material was animal or plant.

Frequently Asked Questions

Is Squalane an Oil?

Chemically, it’s a hydrocarbon, and the Molecules paper groups it with Squalene as a lipid. For how lipid ingredients fit into a routine, see this guide to supporting the moisture barrier.

Does Squalene Affect How Long a Product Lasts?

It can. The Molecules paper links Squalene’s susceptibility to oxidation to a shorter shelf life for the formulas that contain it. That’s a reason to check the opening date on any product listing Squalene high up and to keep it away from heat and light.