Squalane

What it is

Squalene occurs naturally in human sebum, but oxidizes quickly once exposed to air, which made it impractical for cosmetic use until it's converted to squalane through hydrogenation. Most cosmetic squalane today comes from plant sources (commonly olive or sugarcane) rather than the historical shark-liver source, which is now uncommon in mainstream skincare. It sits in the 'emollient' category — different from a humectant like hyaluronic acid, which attracts water rather than sealing it in.

What it does

Squalane is the stable, hydrogenated form of squalene, a lipid the skin produces naturally. As an emollient, it helps soften skin and reduce moisture loss without the heavier feel of some plant oils.

Who it’s for

Broadly suitable across skin types, including oily and acne-prone skin, since it's non-comedogenic for most people and has a lighter texture than many plant oils.

Possible benefits

• Helps soften skin and support the skin's moisture barrier
• Lighter, faster-absorbing texture compared with many plant oils
• Generally considered non-comedogenic for most skin types
• Can be used alone or mixed into other products to add slip and softness

Irritation & compatibility considerations

Squalane is widely considered one of the more universally tolerated emollients, with a low rate of reported reactions. As with any oil-like ingredient, a small subset of very acne-prone individuals may find any added oil doesn't suit their skin — patch testing on a new area first is a reasonable precaution.

How it fits into a routine

Typically used as one of the last steps in a routine, after water-based serums, to help seal in hydration. Can also be mixed with a moisturizer or foundation for extra slip, or used alone as a simple, minimalist last step.