What Is the Benefit of Omega 3 6 9? What a Capsule Supplies

An omega 3 6 9 supplement is a plant oil, usually flaxseed and sometimes blended with borage or evening primrose, that supplies the three families of unsaturated fat in one capsule: the essential omega-3 ALA, the essential omega-6 linoleic acid and the non-essential omega-9 oleic acid. Its benefit is a measured daily dose of ALA from a plant, with the omega-6 and omega-9 the seed naturally carries alongside. What it does not supply is EPA or DHA, the long-chain omega-3s from oily fish and algae that the heart, brain and vision claims on the GB register are written for, so choosing between an omega 3 6 9 and an EPA and DHA oil is choosing which omega-3 you want.¹

• Omega-3 (ALA): essential; about 5% converts to EPA, under 1% to DHA; the register's cholesterol claim applies at 2 g a day^{2, 7}
• Omega-6 (linoleic acid): essential; lower cardiovascular risk in cohorts; no rise in inflammatory markers in 15 trials^{3, 4}
• Omega-9 (oleic acid): not essential, the body makes it; the main fat in olive and rapeseed oil
• Suits: vegans, people who eat oily fish and want a plant ALA source too, people who dislike fish oil; anyone aiming at the 250 mg EPA and DHA thresholds wants a fish or algal oil

Sources checked on 29 October 2026.

What is omega 3 6 9?

The numbers name where the first double bond sits in each fatty acid's carbon chain, counted from the tail end; they are not grades or strengths. Flaxseed (linseed) oil is roughly half ALA with smaller shares of linoleic and oleic acid, so a capsule of it is "omega 3-6-9" by nature rather than by formulation. Fish, krill and algal oils supply EPA and DHA ready-made. What are the differences between omega-3, 6 and 9 walks through the chemistry; does flaxseed oil contain omega-3, 6 and 9 has the seed's numbers.

What is the benefit of omega-3-6-9?

A counted daily amount of ALA from a plant, for people who do not get omega-3 from oily fish or who want a plant source alongside it. In the largest pooled analysis, 41 cohorts and 1.2 million people, those with the highest ALA intake had about 10% lower all-cause and 8% lower cardiovascular mortality than those with the lowest, and each extra gram a day went with 5% lower risk; the randomised trials of ALA are fewer and mostly neutral on heart events, with a lower rate of arrhythmia.^{2, 6} On the GB register the authorised wording is that ALA contributes to the maintenance of normal blood cholesterol levels, obtained at 2 g of ALA a day, which two tablespoons of ground flaxseed or one of flaxseed oil provides.¹

What is omega-3-6-9 good for?

ALA is burned for fuel, built into cell membranes and converted in small part to EPA: tracer studies put the conversion at about 5% to EPA and under 1% to DHA in most adults, so an ALA supplement raises blood EPA a little and DHA not at all.⁷ Linoleic acid's "inflammatory" reputation has not survived testing: 15 randomised trials found no rise in any inflammatory marker when intake went up, and across 30 cohorts and 68,659 people higher blood linoleic acid went with 7% lower cardiovascular disease and 22% lower cardiovascular death.^{3, 4} Oleic acid is about three-quarters of olive oil, and olive oil tracks 16% lower cardiovascular disease and 11% lower all-cause mortality per 25 g a day across cohorts; that is evidence for a food eaten by the tablespoon rather than for the low hundreds of milligrams in a capsule, and the body makes oleic acid.⁵ What are the dangers of omega-6 and what are the dangers of omega-9 take each further.

Does the omega-6 to omega-3 ratio matter?

Not according to anyone who has had to rule on it. EFSA set separate intakes for linoleic acid, ALA and EPA plus DHA and declined to set a ratio; the American Heart Association concluded that cutting omega-6 to "improve" the ratio would more likely raise heart disease risk than lower it; and every health claim submitted in Europe that rested on a ratio was rejected as unsubstantiated.^{1, 8, 15}

Omega 3 6 9 benefits for vegans and people who avoid fish

It suits three readers: vegans and vegetarians, whose blood EPA and DHA run lower than fish-eaters'; people who eat oily fish and want a plant ALA source as well; and people who cannot stomach fish oil.⁹ It is not the route to the register's EPA and DHA thresholds: the heart claim needs 250 mg of EPA and DHA a day and the brain and vision claims 250 mg of DHA, which come from two portions of fish a week (about 450 mg a day by SACN's arithmetic), a fish or krill oil, or an algal oil, whose DHA raised blood levels as well as cooked salmon did.^{1, 10, 11} Is it better to take omega-3 or omega 3-6-9 is the decision page; the Wellgard omega-3 guide is the long version.

What are the benefits of taking omega-3, omega-6 and omega-9 softgel capsules?

The same as the oil inside them, in a counted dose. A 3-6-9 capsule is usually flaxseed oil: a day's serving supplies several hundred milligrams of ALA against the register's 2 g cholesterol-claim threshold, with linoleic acid and oleic acid and often vitamin E, which contributes to the protection of cells from oxidative stress; it contains no EPA or DHA, so the 250 mg EPA and DHA thresholds are met from fish or algal oil.

What we don't know

No trial has compared a flaxseed omega 3-6-9 capsule with a fish or algal oil on any outcome. The ALA mortality figures come from cohorts, which cannot prove cause, and the same pooling found cancer mortality 6% higher at the highest intakes, an association no trial has tested.²

Frequently asked questions

Does taking omega-3-6-9 daily help with sleep?

No trial has tested a 3-6-9 on sleep. For EPA and DHA, a 2021 review of 12 trials found no effect on adults' sleep duration, quality or insomnia severity, with small effects only in infants and children with sleep problems.¹²

Can daily omega-3-6-9 help with arthritis?

The joint evidence is for EPA and DHA, not ALA: across 17 trials of three to four months, omega-3 modestly reduced patient-reported pain, morning stiffness and painkiller use in rheumatoid arthritis and other inflammatory joint pain, and no joint claim is authorised for any omega-3.¹³ A flaxseed 3-6-9 has not been tested for joints.

Does omega-3-6-9 help with anxiety?

We found no trial of a 3-6-9 for anxiety, and for EPA and DHA a 2023 review found only one trial reporting lower anxiety, too few to pool; the depression findings are for oils that are at least 60% EPA, at 1 to 2 g of EPA a day.¹⁴ Low mood or anxiety is a reason to see a GP.

What happens when you take omega-3-6-9 every day?

Blood ALA rises within weeks and EPA a little; DHA does not change.⁷ There is nothing to feel.

Is it safe to take omega 3-6-9 every day?

Yes, at label doses. The atrial fibrillation signal in omega-3 trials concerns EPA and DHA, chiefly above 1 g a day, not ALA;¹⁶ the label asks anyone on medication, pregnant or breastfeeding to consult their GP. What are the side effects of omega-3, 6 and 9 goes effect by effect.

Sources

1. Department of Health and Social Care. Great Britain nutrition and health claims (NHC) register. gov.uk, page last updated 19 May 2026.
2. Naghshi S, et al. Alpha linolenic acid and risk of all cause, cardiovascular and cancer mortality. BMJ, 2021. Meta-analysis, 41 cohorts, 1,197,564 people; university-funded, no conflicts declared. PubMed 34645650.
3. Marklund M, et al. Biomarkers of dietary omega-6 fatty acids and cardiovascular disease. Circulation, 2019. Pooled analysis, 30 cohorts, 68,659 people; NIH-supported, two authors report funding from a food manufacturer. PubMed 30971107.
4. Johnson GH, Fritsche K. Dietary linoleic acid and markers of inflammation. Journal of the Academy of Nutrition and Dietetics, 2012. Systematic review, 15 randomised trials; funding not stated on PubMed. PubMed 22889633.
5. Martínez-González MA, et al. Olive oil consumption and cardiovascular disease, cancer, diabetes and mortality. Clinical Nutrition, 2022. Meta-analysis, 24 cohorts and 1 trial, up to 1.3 million people; funding not stated on PubMed. PubMed 36343558.
6. Abdelhamid AS, et al. Omega-3 fatty acids for the prevention of cardiovascular disease. Cochrane Database of Systematic Reviews, 2020. Cochrane review, 86 trials, 162,796 people, 12 to 88 months; non-commercial funding, no conflicts declared. PubMed 32114706.
7. Plourde M, Cunnane SC. Extremely limited synthesis of long chain polyunsaturates in adults. Applied Physiology, Nutrition, and Metabolism, 2007. Review; funding not stated on PubMed. PubMed 17622276.
8. Harris WS, et al. Omega-6 fatty acids and risk for cardiovascular disease. Circulation, 2009. AHA science advisory; funding not stated on PubMed. PubMed 19171857.
9. Sarter B, et al. Blood DHA and EPA in vegans and an algal omega-3 supplement. Clinical Nutrition, 2015. Cross-sectional study, 165 vegans, 46 supplemented for 4 months; funding not stated on PubMed. PubMed 24679552.
10. Scientific Advisory Committee on Nutrition. Advice on fish consumption: benefits and risks. gov.uk, published 1 December 2004.
11. Arterburn LM, et al. Algal-oil capsules and cooked salmon: nutritionally equivalent sources of DHA. Journal of the American Dietetic Association, 2008. Randomised open-label trial, 32 adults, 2 weeks; industry-affiliated authors. PubMed 18589030.
12. Dai Y, Liu J. Omega-3 long-chain polyunsaturated fatty acids and sleep. Nutrition Reviews, 2021. Systematic review, 12 trials and 8 longitudinal studies; NIH-supported. PubMed 33382879.
13. Goldberg RJ, Katz J. Analgesic effects of omega-3 supplementation for inflammatory joint pain. Pain, 2007. Meta-analysis, 17 randomised trials, 3 to 4 months; funding not stated on PubMed. PubMed 17335973.
14. Kelaiditis CF, et al. Long-chain omega-3 fatty acids for anxiety and depression in adults. Prostaglandins, Leukotrienes and Essential Fatty Acids, 2023. Meta-analysis, 10 randomised trials, 1,426 adults; funding not stated on PubMed. PubMed 37028202.
15. EFSA Panel on Dietetic Products, Nutrition and Allergies. Scientific opinion on dietary reference values for fats. EFSA Journal, 2010. doi.org/10.2903/j.efsa.2010.1461.
16. Gencer B, et al. Marine omega-3 supplementation and the risk of atrial fibrillation. Circulation, 2021. Meta-analysis, 7 trials, 81,210 people, 4.9 years; NIH-supported. PubMed 34612056.

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This article is general information, not medical advice. If you take medication, are pregnant or breastfeeding, speak to your GP before adding any supplement.