How much omega-3 is too much?

Too much omega-3, on the regulator's ceiling and on the healthy adult's, counted in EPA and DHA

How much omega-3 is too much has a regulator's answer and a healthy adult's answer, and the variant that asks about omega-6 has a third, so the page answers all three. The regulator's: five grams of supplemental EPA and DHA a day, the European opinion's tolerable upper level, set after weighing bleeding, blood lipids, glycaemic control and immune function and finding no concern below it, the figure the two- and three-gram claims carry as their do-not-exceed statement and the number above which nobody should go. The healthy adult's: lower, and set by evidence the regulator's opinion predated, the cardiovascular outcome trials' finding of a dose-related rise in atrial fibrillation risk, most evident at four grams a day, present at around two and small or absent below a gram, so that for a healthy lifter without a triglyceride or blood pressure reason, too much begins at about a gram, the omega-3 index research target being as high as the evidence supports, and the rungs above it, two grams for the triglyceride claim, three for blood pressure and four as a prescription or research dose, being for readers with a reason and a GP, the high-dose page's ladder. Counted in EPA and DHA, always: 3000mg of fish oil at a standard 30% is about a gram of actives and not three, so a reader who reads their dose in oil weight overstates it three times, and the ceilings are crossed by concentrates and by many softgels rather than by one standard softgel a day, which sits at 300mg and a twentieth of the regulator's level.

Too much omega-6, which is not a toxicity but a crowding, the fix that is not avoidance, and both families filed

Too much omega-6 is a different kind of question, because omega-6 has no upper level and no toxicity at dietary intakes. Linoleic acid, the omega-6 of seed oils, sunflower, corn, soybean and rapeseed, of fried and processed food, of nuts and seeds and grains, is an essential fatty acid the body needs in small amounts and eats in large ones, the modern diet supplying it at many times the omega-3 intake, and no regulator has set an upper level for it because no intake in the range people eat produces a harm the trials can find, the cardiovascular literature if anything associating higher linoleic acid intake with lower risk when it replaces saturated fat. So too much omega-6 is not a poisoning but a crowding: EPA and DHA and the omega-6 fatty acids compete for the same enzymes and the same places in cell membranes, and a diet heavy in omega-6 and light in omega-3 fills membranes with omega-6 and leaves less room for omega-3, the omega-3 index falling on a seed-oil-and-no-fish diet faster than the omega-3 intake alone would predict, the ratio literature's finding, and the depletes page's crowding. The fix that the ratio literature supports is not avoidance of omega-6, which is neither possible nor beneficial, but the raising of omega-3, two portions of fish a week with one oily or a standard softgel, since the evidence favours adding omega-3 over cutting omega-6 and the index responds to the omega-3 side, with the sensible household changes being olive oil for cooking, fewer fried and processed foods and no war on nuts, seeds or wholegrains, which carry omega-6 alongside things worth eating. Both families filed: omega-3 too much above five grams by the regulator and above about a gram for a healthy adult by the atrial fibrillation signal, counted in EPA and DHA, and omega-6 too much not as a toxicity but as a crowding fixed by raising omega-3, with the worked example being a standard softgel well under either ceiling, one at 17p, £14.99 for 90.

The verdict, a ceiling for omega-3 and a crowding for omega-6

How much omega-3 is too much: above five grams of supplemental EPA and DHA a day on the regulator's safe level, and for a healthy adult without a triglyceride or blood pressure reason above about a gram, where the outcome trials' dose-related atrial fibrillation signal begins to matter and the high rungs need a GP, counted in EPA and DHA rather than oil weight, while too much omega-6 is not a toxicity, no upper level existing and no harm appearing at dietary intakes, but a crowding of omega-3 out of membranes by a diet heavy in seed oils and fried food, fixed by raising the omega-3 with oily fish or a softgel rather than by avoiding the nuts, seeds and wholegrains that carry omega-6 alongside things worth eating. A standard softgel well under either ceiling: Futuro Labs Omega 3 Fish Oil, one softgel with food, 180mg EPA and 120mg DHA, 90 for £14.99 at 17p a day.

What to check on the label

Questions people also ask

How much omega-3 per day is too much?

Above five grams of supplemental EPA and DHA a day on the regulator's safe level, and for a healthy adult without a triglyceride or blood pressure reason above about a gram, where the outcome trials' dose-related atrial fibrillation signal begins to matter, counted in EPA and DHA rather than fish oil weight.

Can you take too much fish oil?

Yes at habitual doses of several grams of EPA and DHA a day, which carry the antiplatelet note, a possible LDL rise and the atrial fibrillation signal, and above five grams no reason at all; a standard softgel at 300mg sits at a twentieth of the safe level.

Can you have too much omega-6?

Not as a toxicity: omega-6 has no upper level and no harm at dietary intakes, and if anything associates with lower cardiovascular risk when it replaces saturated fat; too much omega-6 is a crowding, a seed-oil-heavy, fish-free diet filling membranes with omega-6 and leaving less room for omega-3.

Should I cut omega-6 to improve my omega-3 ratio?

No: the ratio literature favours raising omega-3 over cutting omega-6, and the omega-3 index responds to the omega-3 side, so the fix is oily fish twice a week or a softgel, olive oil for cooking and fewer fried and processed foods, with no war on nuts, seeds or wholegrains.

Is 3000mg of fish oil too much?

No: 3000mg of standard fish oil is about a gram of EPA and DHA, the omega-3 index research target and the top of the practical range for a healthy adult, well under the five-gram safe level, and a reader who reads 3000 as the actives has overstated the dose three times.

Sources

1. EFSA Panel on Dietetic Products. Scientific opinion on the tolerable upper intake level of EPA, DHA and DPA: supplemental intakes of EPA and DHA combined up to about 5g/day do not raise safety concerns for adults. EFSA Journal 2012;10(7):2815. https://www.efsa.europa.eu/en/efsajournal/pub/2815
2. Meta-analyses of cardiovascular outcome trials of marine omega-3: a dose-related increase in the risk of atrial fibrillation, most evident at doses of four grams a day and small or absent below one gram, a finding that sets the honest ceiling of high-dose omega-3 for a healthy adult. PubMed record
3. Review literature on the dietary omega-6 to omega-3 ratio: current evidence favours raising absolute EPA and DHA intake over targeting a specific ratio, and does not support omega-6 restriction for health outcomes. PubMed record
4. Harris WS, von Schacky C. The omega-3 index: red blood cell EPA and DHA as a measurable marker of omega-3 status, the research standard for judging how effectively intake raises tissue levels. PubMed record

Related answers

• How much omega-3 for athletes?
• How much omega-3 daily intake limit should you take?
• How much omega-3 dosage by age should you take?
• How much omega-3 per day for a woman?
• How much omega-3 should a gym goer take daily?
• How much omega-3 is safe to take per day?