Squalane

How it works

Squalane is the hydrogenated, stable form of squalene, a lipid naturally produced by human sebaceous glands. Because its molecular structure closely resembles our own skin lipids, squalane integrates easily into the lipid matrix, softening skin and reducing water loss without the oxidative instability of natural squalene, which degrades quickly on exposure to air. Our own squalene production declines with age, which is one reason mature skin often benefits noticeably from topical replenishment.

The evidence

Squalane's biocompatibility and emollient benefits are well documented, and its stability advantage over squalene is a straightforward chemistry improvement rather than a marketing claim. Most modern squalane is plant-derived from olives or sugarcane, which also resolved the historical sustainability concerns tied to shark-liver-derived squalene. I consider it one of the safest, most predictable emollients in the entire cosmetic ingredient toolkit.

Suitability

• Suitable for essentially all skin types, including oily and acne-prone skin
• Particularly valuable for dry, mature, or barrier-compromised skin
• Non-irritating and safe during pregnancy
• Comedogenic rating is very low, though individual pore congestion varies

Concentration

Squalane can be used as a near-100% pure facial oil or blended at 1-10% within moisturizers and serums. There is no meaningful upper safety limit; the right amount depends on how much occlusion your skin needs, not a percentage threshold, so oilier skin types can simply use less rather than avoiding it entirely.

Conflicts & combinations

• Layers well under or over ceramides and ceramide-containing moisturizers
• Pairs with hyaluronic acid and polyglutamic acid to seal in hydration
• No known conflicts with acids, retinoids, or vitamin C — often used to buffer irritation from all three
• A dependable last step to seal in actives on nights when skin feels particularly reactive