Squalane vs Squalene: The One Letter That Changes Everything

The difference between squalene and squalane is a single hydrogen molecule — the result of a hydrogenation process that converts the unstable, naturally occurring squalene into the stable, cosmetically useful squalane.

Squalene (INCI: Squalene) is a triterpene found naturally in human sebum, olive oil, amaranth seed, and — historically — shark liver oil. It is highly unsaturated, which makes it prone to oxidation. Oxidised squalene is a known contributor to comedone formation. For this reason, pure squalene is rarely used in modern cosmetic formulations.

Squalane (INCI: Squalane) is the hydrogenated, saturated form. It is stable, non-comedogenic, lightweight, and closely mimics the skin's own lipid structure. It is one of the most well-tolerated emollients available and is suitable for virtually all skin types including acne-prone and sensitive skin.

The Source Question

Historically, squalene was sourced from shark liver oil — a practice that drove significant overfishing of deep-sea shark species. The cosmetics industry's shift to plant-derived squalane (primarily from sugarcane, olive, and amaranth) has been one of the more positive sustainability developments of the past decade.

"The INCI name 'Squalane' does not disclose the source. A brand claiming plant-derived squalane should be able to provide documentation."

The INCI name Squalane is the same regardless of source. Brands that source from sugarcane will sometimes note "sugarcane-derived" in their marketing, but this is not required on the label. If source transparency matters to you, it requires a direct question to the brand.

On the INCI List

Squalane typically appears in the mid-to-lower section of an INCI list, at concentrations of 1–10%. Its position relative to other emollients gives you a rough sense of the formula's emolliency profile. A formula with Squalane appearing before heavier occlusives like Petrolatum or Dimethicone is likely to have a lighter, faster-absorbing texture.

The Sourcing Question: Shark vs. Plant-Derived

Squalane's history is complicated by its original source. Squalene — the precursor to squalane — was historically extracted from shark liver oil, which contains squalene at concentrations of 40–80%. The cosmetic industry's demand for squalene was a contributing factor to shark population decline in the 20th century.

The shift to plant-derived squalane — primarily from olive oil (*Olea Europaea* squalene) and sugarcane (via fermentation) — has largely resolved this ethical issue. However, the INCI name "Squalane" does not distinguish between shark-derived and plant-derived material. Brands that claim plant-derived squalane should be able to provide documentation.

Sugarcane-derived squalane (produced via fermentation using *Saccharomyces cerevisiae*) is considered the most sustainable source and has become the industry standard for premium formulations. Olive-derived squalane is also widely used and well-characterised.

Skin-Identical Emolliency

Squalane's primary cosmetic value is its skin-identical nature. Human sebum contains approximately 12% squalene, making squalane one of the most biocompatible emollients available. This skin-identical quality means it is exceptionally well-tolerated — even by reactive, sensitive, and acne-prone skin types.

The non-comedogenic profile of squalane is well-established. Unlike many plant oils with high oleic acid content (which can be comedogenic for some individuals), squalane does not contribute to comedone formation. This makes it one of the few emollients that can be recommended broadly across skin types.

Antioxidant Activity

Squalane has mild antioxidant activity, though this is often overstated in marketing materials. The hydrogenation process that converts squalene to squalane reduces (but does not eliminate) its antioxidant capacity. The primary cosmetic value of squalane is as an emollient and skin-identical lipid, not as an antioxidant. Products that market squalane primarily for its antioxidant properties are emphasising a secondary benefit.

Formulation Versatility

Squalane is one of the most formulation-friendly emollients available. It is:

- Compatible with both oil-in-water and water-in-oil emulsions - Stable across a wide temperature range - Non-greasy with a dry, fast-absorbing skin feel - Compatible with all common cosmetic actives including retinoids, AHAs, and vitamin C - Suitable as a standalone facial oil or as a formulation component

Its dry skin feel makes it particularly valuable in formulations targeting oily or combination skin types, where heavier emollients may feel uncomfortable. It is also commonly used as a carrier for oil-soluble actives such as retinol and fat-soluble vitamins.

The 100% Squalane Trend

The popularity of 100% squalane facial oils — pioneered by brands like Biossance and The Ordinary — reflects a broader consumer shift toward single-ingredient, transparent formulations. A 100% squalane product is exactly what it claims to be: pure, stable, non-comedogenic emolliency with no additional actives, fragrances, or preservatives.

For consumers who react to complex formulations, a 100% squalane oil is one of the safest emollient choices available. For consumers seeking active benefits, it is best used as a carrier or finishing oil rather than a standalone treatment.

Reading the INCI List for Squalane

When evaluating products containing squalane, the key questions are:

1. Position in the list: Squalane at 5–10% (mid-list) provides meaningful emolliency. Squalane at the very end of the list (below 1%) is present primarily as a texture modifier.

2. Source transparency: Does the brand disclose whether the squalane is plant-derived? This matters both ethically and for consumers who prefer vegan formulations.

3. Formulation context: Squalane works best in combination with humectants (glycerin, sodium hyaluronate) and occlusives (petrolatum, dimethicone) for comprehensive moisturisation. A squalane-only moisturiser may not provide adequate hydration for very dry skin types.

The Bottom Line

Squalane is one of the most evidence-supported, well-tolerated, and formulation-versatile emollients in cosmetic chemistry. Its skin-identical nature, non-comedogenic profile, and compatibility with all skin types make it a genuinely useful ingredient.

The marketing around squalane is generally honest — which is unusual in the skincare industry. The main area requiring scrutiny is sourcing transparency. Plant-derived squalane is the ethical and increasingly the industry-standard choice.