What is the fatty acid composition of flaxseed oil?

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Last updated: November 14, 2026 • View editorial policy

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Flaxseed Oil Composition

Flaxseed oil is predominantly a polyunsaturated fat, specifically rich in omega-3 alpha-linolenic acid (ALA), which comprises 40-68% of its fatty acid content, making it the most concentrated plant-based source of omega-3 fatty acids. 1

Detailed Fatty Acid Profile

The fatty acid composition of flaxseed oil consists of:

  • Alpha-linolenic acid (ALA, 18:3n-3): 40-68% - the dominant omega-3 polyunsaturated fatty acid 2, 3, 4, 5
  • Linoleic acid (LA, 18:2n-6): 14-31% - an omega-6 polyunsaturated fatty acid 3, 4, 6
  • Oleic acid (18:1): 17-23% - a monounsaturated fatty acid 3, 6
  • Saturated fatty acids: 9-10% total, primarily:
    • Palmitic acid (16:0): 5-6% 3, 6
    • Stearic acid (18:0): 4-7% 3, 4, 6

Classification and Nutritional Context

Flaxseed oil is classified as a polyunsaturated fat source because over 70% of its total fatty acid content consists of polyunsaturated fatty acids (combining both omega-3 ALA and omega-6 linoleic acid). 6

The oil is specifically recognized in clinical guidelines as a plant-based source of essential omega-3 fatty acids. 1, 7, 8 Both ALA and linoleic acid are essential fatty acids that humans cannot synthesize and must obtain through diet. 1

Clinical Relevance

Guidelines consistently identify flaxseed oil alongside canola and soybean oils as primary plant sources of ALA for cardiovascular health. 7, 8 The oil provides an accessible and inexpensive alternative to seafood-derived omega-3 fatty acids (EPA and DHA), though evidence for ALA's cardiovascular benefits remains mixed compared to marine sources. 1

Important caveat: Flaxseed oil is highly susceptible to oxidation due to its high polyunsaturated fat content. 9 It should be refrigerated and consumed shortly after opening to prevent rancidity and maintain nutritional quality.

References

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