Who should avoid omega-3?

Three columns, because avoid, ask and adjust are different instructions, and the avoid column first

Who should avoid omega-3, and the variants asking who should avoid taking omega-3 and fish oil, are answered with three columns, avoid, ask and adjust, because the internet's single list of people who should not take fish oil mixes three instructions that mean different things, and the avoid column, when it is separated out, is almost empty. Avoid: a reader whose cardiologist has told them to stop, usually after an episode of atrial fibrillation while on a high-dose habit, the outcome trials' dose-related rhythm signal at two to four grams a day having become a personal fact for that reader, so that the high rungs are closed to them and even the standard rung is the cardiologist's call, the one genuine stop on the shelf and a doctor's rather than a page's; and a reader with a severe fish allergy, the anaphylactic kind, who has not cleared fish oil with an allergist, since refined fish oil contains little or no fish protein and most fish-allergic people tolerate it, but the allergy guidance is to confirm that with an allergist rather than to test it at home, and an algal oil carries the DHA sentences with no fish in it as the safe alternative until they do. Two entries, one of which is really a doctor's instruction and one of which is a temporary avoid pending a specialist, and nobody else on it, because omega-3 is a fat with no organ harm at supplement doses, no accumulation and no contraindication in the way a mineral has a failed kidney.

The ask column and the adjust column, the everyone-else column, and the three columns filed

Ask: three readers who take it with a conversation rather than not at all. Anticoagulant and antiplatelet users, on warfarin, a direct oral anticoagulant, aspirin or clopidogrel, since EPA and DHA modestly reduce platelet stickiness, an effect small at supplement doses and relevant at gram-and-above ones, so the fish oil is mentioned to the prescriber rather than stopped and a standard softgel is usually of no concern. Anyone facing surgery, who tells the team and pauses a high-dose habit a week or two before on their advice. A reader already on prescription omega-3 for raised triglycerides, who does not add a shelf softgel on top, the prescription being the dose. Adjust: three readers who take it in a particular form or at a particular dose. Pregnancy and breastfeeding, where omega-3 is wanted for the maternal DHA claim at 200mg a day and the adjustment is the source, a body-oil fish oil or an algal DHA and never a liver oil, whose preformed vitamin A pregnancy advice says to avoid, with the amount confirmed by a midwife. Kidney and liver disease, where a fat is safe and the adjustment is a body oil, since vitamin A handling changes in both, at a dose the nephrologist or hepatologist sets as part of the whole regimen, with the antiplatelet note beside dialysis heparin. A fish allergy that has been discussed with an allergist and prefers to avoid fish altogether, which chooses an algal oil. And the site's own line, applied to every supplement here: no guidance for under-eighteens, whose omega-3 is a family plate's fish and whose supplements are a parent's and a GP's question. Everyone else, which is nearly everyone, takes a standard softgel by the oily-fish audit, one for the 250mg heart claim if fish is eaten rarely and none if oily fish is eaten twice a week, every day within the practical range and for years on the outcome trials' file. The columns filed: avoid holding a cardiologist's stop and an uncleared severe fish allergy, ask holding anticoagulants, surgery and prescription omega-3, adjust holding pregnancy, kidney and liver disease and a fish allergy that chooses algal oil, and everyone else on a standard softgel, with the worked example being that body-oil softgel for the everyone-else column, one at 17p, £14.99 for 90.

The verdict, an avoid column with two entries, both a specialist's, and a long everyone-else column

Who should avoid omega-3: almost nobody outright, the avoid column holding a reader whose cardiologist has said stop after atrial fibrillation on a high-dose habit and a reader with a severe fish allergy not yet cleared with an allergist, the ask column holding anticoagulant and antiplatelet users at gram-and-above doses, anyone facing surgery and a reader already on prescription omega-3 who does not double it, and the adjust column holding pregnancy, which avoids liver oils for their vitamin A and takes a body oil or algal DHA, kidney and liver disease, which take a body oil at a specialist's dose, and a fish allergy that chooses an algal oil, with under-eighteens outside this site's remit and everyone else taking a standard softgel by the oily-fish audit. The standard body-oil softgel for the everyone-else column: Futuro Labs Omega 3 Fish Oil, one with food, 180mg EPA and 120mg DHA, no vitamin A, 90 for £14.99 at 17p a day.

What to check on the label

Questions people also ask

Who should not take omega-3 supplements at all?

Almost nobody outright: a reader whose cardiologist has said stop after atrial fibrillation on a high-dose habit, and a reader with a severe fish allergy not yet cleared with an allergist, who takes an algal oil meanwhile; everyone else is in the ask or adjust columns or takes a standard softgel by the oily-fish audit.

Can people with a fish allergy take omega-3?

Usually, since refined fish oil contains little or no fish protein and most fish-allergic people tolerate it, but the guidance is to confirm with an allergist rather than test it at home, and an algal oil carries the DHA sentences with no fish in it as the safe choice until then or instead.

Should pregnant women avoid fish oil?

No, they should adjust the form: the register carries a maternal DHA claim at 200mg a day and omega-3 is wanted, but liver oils such as cod liver oil are avoided for their preformed vitamin A, so the source is a body-oil fish oil or an algal DHA with the amount confirmed by a midwife.

Should people on blood thinners avoid omega-3?

No, they should ask: EPA and DHA modestly reduce platelet stickiness, an effect small at supplement doses and relevant at gram-and-above ones, so a reader on warfarin, a direct oral anticoagulant, aspirin or clopidogrel mentions the fish oil to the prescriber, with a standard softgel usually of no concern.

Should people with kidney or liver disease avoid fish oil?

No, they should adjust: a fat is safe in both, used in dialysis and studied in fatty liver, and the adjustment is a body oil with no vitamin A, since vitamin A handling changes in both conditions, at a dose the nephrologist or hepatologist sets as part of the whole regimen.

Sources

1. 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
2. The fish allergy and fish oil literature: fish allergy is to fish proteins, and refined fish oil contains little or no protein, so most fish-allergic people tolerate fish oil supplements, but the allergy guidance is to discuss it with an allergist and to prefer an algal oil where doubt exists. PubMed record
3. The cod liver oil and vitamin A literature: cod liver oil carries preformed vitamin A at hundreds of micrograms per teaspoon or capsule, the adult upper level for preformed vitamin A being 3000 micrograms a day and pregnancy advice being to avoid liver oils, so a cod liver oil stacked with a multivitamin or a vitamin A supplement is the one combination in which a fish oil can push a vitamin over its limit. https://www.gov.uk/government/publications/sacn-vitamin-a-and-health
4. 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

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