Squalane in skincare: what it is, how it works, and who should use it
A complete guide to squalane — what makes it different from other facial oils, how it compares to squalene, its comedogenic profile, and who benefits most from adding it to a skincare routine.
· By MedSpot Editorial · 5 min read
Squalane appears in a wide range of moisturizers, serums, and facial oils — often without explanation of what it actually does or why it behaves differently from other oils. Here's the science behind one of skincare's most versatile emollients.
Squalane vs. squalene: the important distinction
Squalene (with an "e") is a lipid naturally produced by human sebaceous glands. It makes up roughly 12–15% of human sebum — making it one of the most significant components of our skin's natural oil production. Squalene is highly unsaturated (six double bonds), which makes it:
- An effective emollient and antioxidant
- Extremely unstable and prone to oxidation when exposed to air
Squalane (with an "a") is hydrogenated squalene — the double bonds have been saturated through a hydrogenation process, producing a stable, shelf-stable molecule. Squalane has the same carbon backbone as squalene and the same sebum-analogous structure, but without the oxidation problem.
This is why squalane is used in skincare products rather than squalene — identical functional benefit, dramatically better stability.
Where squalane comes from
Historically, squalene was extracted from shark liver oil — sharks accumulate squalene in their livers as a buoyancy mechanism. This sourcing remains in some products (and is an animal welfare concern worth knowing about).
Modern skincare squalane is predominantly plant-derived, from:
- Olive oil (most common) — olive squalene is extracted and then hydrogenated
- Sugarcane — fermentation-derived squalane (Amyris is the major commercial supplier); chemically identical to olive-derived squalane
- Rice bran, wheat germ, amaranth — minor sources
Practical difference: Olive-derived and sugarcane-derived squalane are chemically identical (C₃₀H₆₂). The fermentation route (sugarcane) is more sustainable and produces a very pure product. Both are equally effective.
How squalane works on skin
Squalane functions primarily as an emollient — it fills spaces between corneocytes (the "mortar" in the skin barrier), reducing TEWL (transepidermal water loss) and leaving skin feeling smooth and soft.
What makes squalane distinctive among oils:
1. Sebum compatibility: Because squalane mirrors the structure of a major sebum component, it integrates readily with the skin's existing lipid film without displacing or disrupting it. This is different from occlusive oils (shea, coconut) that sit more on top of the skin.
2. Extremely low molecular weight for an oil: At 422 g/mol, squalane is lighter than most emollient oils, giving it a non-greasy, fast-absorbing texture that works on oily and combination skin types.
3. Non-comedogenic: Squalane has a comedogenicity rating of 0–1 on most scales. The mechanism: it does not block follicular openings the way high-oleic, high-comedogenicity oils (coconut, wheat germ) do. This makes it suitable for acne-prone skin.
4. Antioxidant activity: Squalane (like squalene) has some inherent free radical scavenging capacity, though it's modest compared to dedicated antioxidants like vitamin C or vitamin E.
Squalane and the comedogenicity question
The non-comedogenic claim for squalane is generally well-supported, but the nuance matters:
- Comedogenicity ratings (0–5 scale) are based on rabbit ear assays — a model that doesn't perfectly translate to human facial skin
- Some individuals with acne-prone skin react to any oil, including squalane
- Squalane alone is not comedogenic; squalane combined with other heavy emollients in a product can contribute to breakouts depending on the full formulation
Practical guidance: Squalane-only products (pure squalane oil) are the safest trial for acne-prone skin. Multi-ingredient moisturizers containing squalane may include other potentially comedogenic ingredients.
What squalane does and does not do
What it does:
- Softens and smooths skin texture (emollient effect)
- Reduces TEWL moderately (not as occlusive as petrolatum, but meaningful)
- Leaves skin with a non-greasy, "skin-like" finish
- Plays well with other ingredients — squalane is compatible with retinoids, acids, vitamin C, and niacinamide
- Works as a makeup finishing oil or serum base
What it does not do:
- Hydrate skin by itself (squalane is not a humectant — it doesn't draw water in; it prevents water from escaping)
- Stimulate collagen
- Treat acne directly
- Function as a sunscreen
Who benefits most from squalane
Dry skin: Excellent daily emollient — can be layered over humectants (hyaluronic acid, glycerin) as a seal, or blended into a moisturizer for additional richness.
Oily/combination skin: Counterintuitively, squalane is one of the few oils well-tolerated on oily skin because it doesn't add a foreign lipid — it supplements the skin's own sebum analog. Many people with oily skin find it non-pore-clogging and non-greasy.
Acne-prone skin: Lower risk than most oils due to the comedogenicity profile. Can be used as a post-acne treatment moisturizer to reduce the dryness associated with acne treatments (benzoyl peroxide, retinoids, salicylic acid).
Mature/dry aging skin: Good addition to increase skin softness and reduce visible fine lines from dehydration. Does not replace the need for collagen-stimulating actives (retinoids, vitamin C), but complements them.
Sensitive/eczema-prone skin: Fragrance-free, non-irritating, and compatible with compromised barriers. Often used in combination with ceramide moisturizers.
How to use squalane
As a standalone oil: Apply 2–3 drops to damp skin after serums, before heavier creams. Damp skin allows the oil to emulsify slightly and spread more evenly.
As a serum booster: Mix 1–2 drops into a serum or moisturizer to increase slip and emollient effect without changing the active ingredient concentration significantly.
As a cuticle and lip treatment: Pure squalane works well as a spot treatment for dry cuticles, rough elbows, or dry lips.
Layering order:
- Cleanser
- Toner / essence (if using)
- Water-based serums (vitamin C, niacinamide, hyaluronic acid)
- Squalane (as facial oil step)
- Moisturizer (if using a rich cream; optional if squalane is sufficient)
- SPF (AM only)
Squalane vs. other facial oils
| Oil | Comedogenicity | Finish | Best for |
|---|---|---|---|
| Squalane | 0–1 | Dry, non-greasy | All skin types including oily/acne-prone |
| Rosehip | 1 | Dry, fast-absorbing | Hyperpigmentation, vitamin A content |
| Jojoba | 2 | Lightweight | Dry to combination |
| Argan | 0 | Lightweight | Dry, mature skin |
| Marula | 3–4 | Richer | Dry, mature — avoid if acne-prone |
| Coconut | 4 | Heavy, occlusive | Dry body, NOT face for acne-prone |
Squalane's zero-to-one comedogenicity and sebum-analogous structure give it the widest applicability of any facial oil.
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