# Linoleic Acid (LA) **Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/linoleic-acid-la **Data Source:** Hermetica Superfoods Ingredient Encyclopedia **Updated:** 2026-03-18 **Evidence Score:** 8 / 10 **Category:** Other **Also Known As:** (9Z,12Z)-octadeca-9,12-dienoic acid, LA, cis,cis-9,12-octadecadienoic acid, omega-6 fatty acid, 18:2 n-6, linolic acid, 9,12-linoleic acid ## Overview Linoleic acid is an essential omega-6 fatty acid that serves as a precursor to arachidonic acid and various eicosanoids. It maintains skin barrier function through ceramide synthesis and modulates inflammatory responses via [prostaglandin](/ingredients/condition/inflammation) pathways. ## Health Benefits - Supports [skin health](/ingredients/condition/skin-health) by maintaining the integrity of the skin barrier, crucial for preventing moisture loss and protecting against environmental damage. - Plays a role in reducing [inflammation](/ingredients/condition/inflammation), which can help alleviate symptoms of conditions like eczema and psoriasis. - Enhances cellular function by being a key component of cell membranes, promoting overall skin vitality. - Contributes to heart health by lowering [LDL cholesterol](/ingredients/condition/heart-health) levels, reducing the risk of cardiovascular diseases. - Aids in the absorption of fat-soluble vitamins such as A, D, E, and K, which are essential for various bodily functions. - Supports [immune function](/ingredients/condition/immune-support) by modulating inflammatory responses, enhancing the body's defense mechanisms. - Promotes hair health by nourishing hair follicles, leading to stronger and shinier hair. ## Mechanism of Action Linoleic acid converts to arachidonic acid via delta-6 desaturase and elongase enzymes, which then produces [prostaglandin](/ingredients/condition/inflammation)s E2 and F2α through cyclooxygenase pathways. It incorporates into phospholipid membranes, particularly phosphatidylcholine and phosphatidylethanolamine, enhancing membrane fluidity and cellular signaling. In skin, it synthesizes ceramides essential for stratum corneum barrier function. ## Clinical Summary Clinical studies on topical linoleic acid show 20-30% improvement in skin hydration and barrier function in participants with dry skin over 4-8 weeks. Small-scale trials (n=30-60) suggest 2-4g daily oral supplementation may reduce [inflammatory](/ingredients/condition/inflammation) markers like IL-6 by 15-25%. Evidence for eczema and psoriasis benefits comes primarily from observational studies and small intervention trials. Larger randomized controlled trials are needed to establish definitive therapeutic effects. ## Nutritional Profile - Contains two double bonds in its carbon chain. - Provides approximately 9 calories per gram. - Essential fatty acid not synthesized by the human body. ## Dosage & Preparation Typical dietary intake ranges from 5-10% of total daily calories. Supplementation should be guided by a healthcare provider. Consult a healthcare provider before use. ## Safety & Drug Interactions Linoleic acid is generally well-tolerated as it's naturally present in many foods, with no established upper intake limit. High doses above 10g daily may increase bleeding risk when combined with anticoagulant medications like warfarin. Excessive omega-6 intake relative to omega-3 fatty acids may promote [inflammatory pathway](/ingredients/condition/inflammation)s in susceptible individuals. Topical applications are safe for most people, though rare allergic reactions can occur in those sensitive to specific plant oils. ## Scientific Research Numerous observational studies have linked adequate linoleic acid intake with reduced [cardiovascular risk](/ingredients/condition/heart-health). Some randomized controlled trials (RCTs) suggest benefits for [skin health](/ingredients/condition/skin-health). ## Historical & Cultural Context Linoleic acid has been used traditionally in various cultures for its skin-moisturizing properties and as a dietary staple in the form of plant oils. ## Synergistic Combinations Oleic Acid, CLA, Vitamin E ## Frequently Asked Questions ### What foods are high in linoleic acid? Sunflower oil contains 65-70% linoleic acid, while safflower oil provides up to 80%. Other rich sources include corn oil (50-60%), soybeans (50-55%), and nuts like walnuts and pine nuts. ### How much linoleic acid do I need daily? The adequate intake is 17g daily for men and 12g daily for women aged 19-50. This represents 5-10% of total daily calories, easily met through 1-2 tablespoons of vegetable oils or a handful of nuts. ### Can linoleic acid help with acne? Studies suggest people with acne have 2.5 times lower linoleic acid levels in skin sebum compared to healthy individuals. Topical linoleic acid may help normalize sebum composition and reduce comedone formation, though more research is needed. ### What's the difference between linoleic acid and alpha-linolenic acid? Linoleic acid is an omega-6 fatty acid with 18 carbons and 2 double bonds, while alpha-linolenic acid is omega-3 with 3 double bonds. Both are essential fatty acids but have opposing inflammatory effects in the body. ### Does cooking destroy linoleic acid? High-heat cooking above 350°F can oxidize linoleic acid, creating harmful compounds like aldehydes. Cold-pressed oils retain more intact linoleic acid, while deep frying can reduce content by 20-40% depending on temperature and duration. ### Is linoleic acid safe during pregnancy and breastfeeding? Linoleic acid is an essential fatty acid that is safe and actually important during pregnancy and breastfeeding, as it supports fetal brain development and is naturally present in breast milk. However, pregnant and nursing women should obtain linoleic acid primarily from whole food sources like nuts, seeds, and oils rather than high-dose supplements, and should consult their healthcare provider about supplementation. Adequate linoleic acid intake during these periods contributes to healthy pregnancy outcomes and infant development. ### Does linoleic acid interact with blood thinners or cardiovascular medications? Linoleic acid has mild anticoagulant properties and may have additive effects when combined with blood thinners like warfarin or aspirin, potentially increasing bleeding risk. If you take cardiovascular medications or anticoagulants, discuss linoleic acid supplementation with your doctor before starting, as dietary sources are generally safe but high-dose supplements warrant medical oversight. Your healthcare provider can monitor your medication effectiveness and adjust dosing if necessary. ### What clinical evidence supports linoleic acid for skin barrier repair? Clinical research shows that topical and dietary linoleic acid significantly improves skin barrier function by restoring ceramide levels, with studies demonstrating reduced transepidermal water loss and improved hydration in both healthy and compromised skin. Multiple dermatological studies confirm that linoleic acid deficiency is associated with impaired skin barrier integrity, and supplementation can help alleviate symptoms of eczema and sensitive skin. The evidence is considered moderate to strong for skin health applications, particularly when combined with other barrier-supporting lipids like oleic acid and palmitic acid. --- *Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com* *License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*