Linum Usitatissimum (Linseed) Seed Oil
INCI: Flax
Reviewed by Daisy · Last updated 18 Aug 2026
Also known as: Flax, Flaxseed Oil, Linoleic Acid, Linseed Seed Oil, Linum Usitatissimum Seed Oil
Plant-derived oil more commonly known as flaxseed oil Significant source of omega fatty acids
EWG Safety Score
What Is Linum Usitatissimum (Linseed) Seed Oil?
Linum usitastissimum (linseed) seed oil is more commonly known as flaxseed oil. It’s a significant plant source of omega fatty acids, primarily an omega-3 fatty acid (linolenic acid) that’s been shown to have a soothing effect on skin.
These polyunsaturated fatty acids, which also include oleic, linoleic, palmitic and stearic acids, enhance skin’s hydration by preventing moisture loss. Linseed/flax oil has been shown to penetrate skin’s uppermost layers easily, carrying other beneficial ingredients with it (but those ingredients also have to be oil soluble so, for example, linseed wouldn’t be a good carrier for water-soluble vitamin C but is great for delivering oil-soluble vitamin E).
Linseed oil is also a top source of lignans, phenolic plant compounds that have antioxidant ability.
How It Works
Flax seed oil works through multiple pathways. The polyunsaturated fatty acids penetrate the outer layers of skin and help reinforce the natural lipid barrier, reducing transepidermal water loss. This supports the skin's ability to retain moisture.
The oil's bioactive compounds, including lignans and phenolic compounds, have antioxidant properties. These may help neutralise free radicals generated by UV exposure and environmental stressors, potentially reducing oxidative damage to skin cells.
Clinical Evidence & References
- Drug Development and Industrial Pharmacy, September 2019, pages 1,451-1,458
- African Journal of Traditional, Complementary, and Alternative Medicine, March 2017, pages 280-286
- Journal of Food Science and Technology, September 2014, pages 1,633-1,653
- Evidence-Based Complementary and Alternative Medicine, June 2011, ePublication
How to Use
If using a product containing flax seed oil, apply as directed in your routine. The oil is typically incorporated into emulsions or serums rather than used alone. For those with oily or acne-prone skin, patch test first, as some users report that certain oils can trigger congestion. Start with minimal frequency if new to the ingredient.
Safety & Precautions
Frequently Asked Questions
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Take the skin quizOther forms of Linum Usitatissimum (Linseed) Seed Oil
These appear on ingredients lists under different names but are the same substance. Linum Usitatissimum (Linseed) Seed Oil is the common form.
Related Ingredients
Linum Usitatissimum Seed Flour
Plant-derived exfoliant and absorbent with a gentle, granular texture
Linum Usitatissimum Seed Oil
A plant oil rich in omega fatty acids, traditionally used to condition and nourish skin
Linum Usitatissimum Seed Extract
Plant extract with traditional soothing uses, now studied for topical skincare
Linseed Extract
Omega-rich flaxseed extract for skin barrier support
Licorice Root
Has antioxidant and soothing properties Helps fight dark spots
Lilium Candidum Callus Culture Extract
A plant-derived extract with antioxidant and purifying properties
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