Linoleic Acid (Omega-6 · LA · Essential Fatty Acid · Skin Barrier Lipid)
| CAS No. | 60-33-3 |
| Class | Lipid · Polyunsaturated Fatty Acid · Essential Omega-6 · C18:2 n-6 |
| Source | Helianthus annuus (Sunflower) — seed (primary, 60–70% LA); also safflower, evening primrose, hemp, grape seed oils |
| Claim strength | High |
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Linoleic acid (LA) is an essential omega-6 fatty acid — the human body cannot synthesise it and must obtain it from diet. In the skin, linoleic acid is a structural component of ceramides in the stratum corneum — its deficiency specifically impairs skin barrier integrity. This skin-specific essential role distinguishes LA and makes it particularly relevant to topical formulations and oral skin health supplementation.
Linoleic Acid for Skin Barrier Function, Essential Fatty Acid Status & Lipid Delivery — Evidence
Skin barrier integrity — essential structural role: Linoleic acid is an obligate component of ceramide 1 (acylceramide) in the stratum corneum. LA deficiency produces ichthyosiform dermatosis. Topically applied LA-rich oils improve skin barrier function and reduce transepidermal water loss in clinical studies. Claim strength: High.
Essential fatty acid supplementation: In clinical nutrition for patients with fat malabsorption, LA is provided as the primary essential fatty acid. Claim strength: High.
Inflammatory balance: LA's role as a precursor to arachidonic acid is frequently misunderstood. Dietary LA at typical intakes does not directly increase inflammatory markers. The concern relates to omega-6:omega-3 eicosanoid balance, not to dietary LA per se. Claim strength: Moderate (nuanced).
Dosage & Formulator Notes
Adequate intake (AI) for linoleic acid is 11–12g per day for women and 14–17g per day for men (US DRI). Readily achievable from dietary vegetable oils. Supplemental LA is primarily used for topical skin barrier support and as a carrier oil vehicle for fat-soluble active ingredients. For topical skin barrier applications, LA-rich carrier oils (rosehip, safflower, evening primrose) are the appropriate specification.
Pairs with: Alpha-linolenic acid (balanced omega-6:omega-3 formulation), GLA (evening primrose oil — next metabolic step for skin health), Vitamin E (antioxidant stabiliser), ceramides (comprehensive skin barrier formulation).
Frequently Asked Questions
Is linoleic acid pro-inflammatory?
No — dietary LA at normal intakes does not directly increase arachidonic acid or inflammatory markers. The omega-6:omega-3 concern relates to competition between arachidonic acid and EPA-derived eicosanoids at the cellular level, not to dietary LA per se.
Why does topical linoleic acid improve skin while oleic acid can worsen it?
LA is a structural component of ceramide 1 in the stratum corneum — topical LA replenishes the barrier. Oleic acid at high topical concentrations disrupts the lamellar barrier structure. LA-rich oils support barrier; oleic acid-rich oils enhance penetration.
What is the recommended daily intake of linoleic acid?
AI is 11–12g per day for women and 14–17g per day for men. Readily achievable from dietary vegetable oils. Supplemental LA is primarily used for topical skin barrier support.
How does rosehip oil differ from evening primrose oil as a linoleic acid source?
Rosehip oil (45% LA + 35% ALA + carotenoids) is positioned for anti-aging and skin regeneration. Evening primrose oil (65–80% LA + 8–10% GLA) targets skin inflammatory conditions and hormonal health.
Claim-strength scale – High = multiple human studies; Moderate = a few trials; Emerging = early lab data.
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