Linoleic Acid
Essential omega-6 fatty acid. Key component of type-1 ceramides (Ceramide EOS, EOH) – the foundation of skin barrier function. In acne patients, sebum linoleic acid is often low, contributing to pilosebaceous inflammation. Topical application in acne and dry skin restores the balance. Present in safflower, sunflower, and grape seed oils.
Evidence by route
Topical application
Linoleic acid deficiency in acne sebum has been confirmed in several studies. Topical use as safflower oil or isolated linoleic acid improves barrier function and reduces comedone activity in small RCTs. The effect is modest but clinically meaningful in a subset of patients.
- Letawe C et al. Clin Exp Dermatol. 1998;23(2):56-58. PMID 9692305
How to read tiers A–F
- BLimited evidence. One RCT or several controlled studies with limitations
Tolerability and safety
- Irritation potential
- Low
- Allergen risk
- Low
- Pregnancy
- Safe
- Suitable for
- Normal, Dry, Combination, Oily, Sensitive
About this ingredient
Linoleic Acid (omega-6, C18:2, vitamin F) is an essential polyunsaturated fatty acid. The body does not synthesize it; it comes from the diet. In skin, linoleic acid is part of long-chain EOS and EOH ceramides – the structural framework of the stratum corneum lipid barrier. Mechanism. On a molecular level, linoleic acid integrates into membrane phospholipids and into ceramides. In acne patients, sebum linoleic acid is consistently low (Downing 1986, Ottaviani 2010) – this disrupts sebocyte differentiation, makes sebum denser and more viscous, promoting comedone formation. Topical replenishment at 2–5% restores sebum composition and reduces microcomedone count (Letawe 1998, n=14). Where applied. Serums for oily and combination skin, barrier-repair creams in atopic dermatitis, post-retinoid recovery formulas. Found in safflower (70–80%), sunflower (60%), grape seed (60–70%), rosehip (45%), and hemp seed (55%) oils. In Spain – in Sesderma C-Vit, Martiderm Reticare lines, pharmacy formulas for atopic skin. Evidence base. An RCT in 13 mild-acne patients (Letawe 1998) showed a 25% reduction in follicular plug size after one month of topical 2.5% linoleic acid. Systematic reviews are not yet available. AAD 2024 atopic dermatitis guidelines mention oils high in linoleic acid as part of emollient therapy. Safety. CIR confirmed safety. Non-comedogenic (comedogenicity 1 on a 0–5 scale), non-irritating, safe for sensitive skin. Unlike oleic acid (omega-9), it does not disrupt the barrier. Pregnancy and lactation – safe. A good retinoid alternative in pregnancy acne, alongside azelaic acid and niacinamide. Suitable for all areas, including face, breast, abdomen. Particularly suitable for. Acne with microcomedones and blackheads, oily skin with a heavy sebum feel, post-acne, sensitive skin after retinoid retinization. Not for monotherapy – works as part of a formula with other barrier-repair components.
Frequently asked questions
Is Linoleic Acid safe during pregnancy?
Linoleic Acid is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
What skin types is Linoleic Acid for?
Linoleic Acid suits: normal, dry, combination, oily, sensitive.
What is Linoleic Acid and what does it do in cosmetics?
Essential omega-6 fatty acid.
Is Linoleic Acid comedogenic?
On the Fulton scale 1/5 – very low comedogenicity. For acne-prone skin, a rating of 3 or higher suggests choosing an alternative.
What's the INCI name for Linoleic Acid?
The INCI name is Linoleic Acid. It may also appear as: Omega-6, C18:2, Vitamin F.
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