Antioxidant

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

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.

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

Flax seed oil is generally well-tolerated in cosmetic formulations. Some individuals with oily skin or fungal acne sensitivities may experience congestion; discontinue if irritation occurs.

Frequently Asked Questions

From the Clinic

Not sure what your skin actually needs?

Two minutes, a few questions, and we’ll point you at what matters — no guesswork.

Take the skin quiz

Other 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.

Learn More About Skincare Ingredients

Explore our comprehensive ingredient glossary to understand what's in your products.

Browse All Ingredients

Authorised Stockist

Official UK retailer

Tracked Delivery

Free UK shipping over £50

5 Star Rating

Trusted by thousands

Expert Advice

Free consultations