Squalane in Skincare: Shark vs Plant-Derived

A multinational study of 2,456 individuals with atopic eczema, dry, or itchy skin found that a moisturizer containing squalane resolved or improved symptoms in over 70% of participants within 38 days, according to research reviewed in PMC. The ingredient works because your skin already makes it. Squalene is a lipid that constitutes roughly 12% of human sebum. Squalane is its hydrogenated, shelf-stable form. The question is where it comes from.

The Chemistry: Squalene vs. Squalane

Squalene (with an “e”) is an unsaturated isoprenoid with six double bonds. It oxidizes rapidly when exposed to air and light. Oxidized squalene doesn’t protect skin. It can contribute to clogged pores and inflammation.

Squalane (with an “a”) is the hydrogenated version. Saturating those double bonds makes the molecule stable, lighter, and non-comedogenic. This is why you see squalane, not squalene, in finished skincare products. The hydrogenation process is the same regardless of source. Once converted, shark-derived and plant-derived squalane are chemically identical molecules.

How Squalane Works on Skin

Squalane functions as an emollient and occlusive. It fills gaps between corneocytes in the stratum corneum, smoothing texture and reducing transepidermal water loss (TEWL). Clinical data shows topical squalane increases skin moisture by up to 40% while actively preventing moisture escape, according to Root Science’s review of the literature.

Because squalane mimics a component of human sebum, it penetrates the epidermis efficiently without triggering breakouts. A 2025 study in Molecules found that squalane at concentrations of 0.005-0.015% counteracted UVA-induced inhibition of collagen biosynthesis and reduced NF-kB and COX-2 expression in human dermal fibroblasts. It does not just moisturize. It has measurable anti-inflammatory and photoprotective effects.

Squalane also functions as a penetration enhancer. A study in Colloids and Surfaces B demonstrated that squalane-based emulsions increased the skin penetration of active polyphenols. Your other serums work better when squalane is in the formula.

The Shark Problem

An estimated 3 to 6 million sharks are killed each year specifically for liver oil, separate from the tens of millions lost to finning and bycatch. Extracting one ton of squalene requires approximately 3,000 sharks.

Deep-sea sharks are the primary targets because their livers contain the highest squalene concentrations. A 2024 study published in Science examined 521 species of deepwater sharks and rays and found that nearly two-thirds of threatened deepwater sharks have been used in liver oil products. Three-quarters of gulper shark species are now threatened with extinction. These species mature late and reproduce slowly. Population recovery takes decades.

The global squalene market was estimated at $150 million in 2023, with cosmetics accounting for over 70% of demand. The economics are straightforward: shark-derived squalene costs about 30% less than plant-derived alternatives. Cost, not efficacy, drives the continued harvest.

Plant-Derived Squalane: Equivalent Efficacy

Olive oil is the richest plant source of squalene, containing up to 300 times more squalene than other vegetable oils. Sugarcane is another major source, using fermentation to produce squalene at industrial scale.

Once hydrogenated to squalane, the molecular structure is identical regardless of origin. A clinical study by FSS found that 2.0% olive-derived squalane increased skin moisturization by 22% within 24 hours and 35% after four weeks of twice-daily application, while significantly reducing TEWL. No study has demonstrated a performance difference between shark-derived and plant-derived squalane in finished cosmetic products.

The cost gap is narrowing. Biotech companies are scaling sugarcane fermentation, and green chemistry research has improved extraction efficiency from olive pomace (a waste product of olive oil production), making plant squalane increasingly competitive.

How to Verify the Source

Product labels list “squalane” without specifying the source. Three ways to check:

Look for explicit claims. Brands using plant-derived squalane almost always say so. “100% plant-derived,” “olive squalane,” or “sugarcane-derived” on the label or product page. Shark-derived products rarely advertise the source.

Check for certifications. Vegan and cruelty-free certifications (Leaping Bunny, PETA) exclude shark-derived ingredients. If a squalane product carries these, the source is plant-based.

Contact the brand. If neither the label nor the website specifies the source, ask. Brands that use plant-derived squalane will confirm it. Evasive answers suggest animal origin.

The Practical Takeaway

Squalane is one of the most effective emollients available. It mimics human sebum, penetrates without clogging, boosts the efficacy of other actives, and has anti-inflammatory properties backed by clinical data. For readers interested in how marine-derived ingredients compare across categories, the same sourcing questions apply to marine collagen.

The ethical calculation is simple. Plant-derived squalane performs identically. The molecule does not remember whether it came from an olive or a shark liver. Choose the version that keeps deep-sea shark populations intact. Your skin will not notice the difference. The ocean ecosystem will.