Health Reference LibraryHow much omega 3 should I take, and how much is too much?
This entry is part of the Nutri Tailor Health Reference Library — cited research on supplements, nutrients and adjacent areas of health.
Summary
Count EPA plus DHA, not the weight of oil on the front of the bottle. 250 to 500 mg a day of EPA plus DHA matches the NHS advice of one portion of oily fish a week and is the general health dose; 1000 to 2000 mg a day is what raised a low omega 3 index into the target range over four months and suits people who eat no oily fish. The European Food Safety Authority found no safety concern up to 5 g a day and US regulators use 3 g. Above 3 g bleeding time can lengthen, so anyone with a clotting disorder or surgery ahead should ask their GP first.
Dose calculator: capsules to reach your omega 3 target
Enter the daily amount of omega 3 you are aiming for and see how many servings of each Nutri Tailor product reach it. Nothing you enter leaves this device. No AI is used.
This tool does arithmetic on the label figures. It is not personal dosing advice and it knows nothing about your history or blood results. The reference intake, the safe upper guide and the trial doses are on this page; talk to your GP or a registered nutritional therapist before changing what you take.
Effective dose
The reference intake is none in the UK; the NHS advice is two portions of fish a week, one of them oily, which delivers roughly 250 to 500 mg of EPA plus DHA a day on average. Count EPA plus DHA, not the oil weight. 250 to 500 mg a day of EPA plus DHA matches the oily fish advice and is the general health dose. 1000 to 2000 mg a day is what moved most people from a low omega 3 index into the target range over four months, and is the range for anyone who eats no oily fish. The large cardiovascular trials used 4 g a day of purified EPA under supervision; that is a supervised dose, not one to copy at home.
Safety profile
How much is too much: the European Food Safety Authority found supplemental EPA plus DHA up to 5 g a day raises no safety concern; US regulators use 3 g a day. Above 3 g a day bleeding time can lengthen, so anyone with a clotting disorder or surgery planned should ask their GP before high doses. Fishy burps and loose stools are the everyday complaints and are reduced by taking the capsule with a meal. Fish liver oils carry vitamin A and are not the way to reach a high omega 3 dose, especially in pregnancy.
Guideline positions
NHS vitamins and minerals guidance for omega 3. NIH Office of Dietary Supplements fact sheet for omega 3 where one exists. The trial doses quoted above are from the sources listed on this page.
Practical framework
Capsules to reach the dose, from the Nutri Tailor range, all made in the UK: [Omega 3 capsules](/products/omega-3), 330 mg EPA and 220 mg DHA per capsule, so one capsule covers the general dose and two to three reach 1100 to 1650 mg; [Krill Oil](/products/krill-oil), 68 mg EPA and 30 mg DHA per 500 mg capsule, for people who want a small capsule at a low dose. To read your own result against the UK ranges, use the free blood test result interpreter. This is a summary of published research, not personal health advice. Talk to your GP or a registered nutritional therapist before changing what you take, especially if you are pregnant, have a diagnosed condition or are under ongoing care.
Common misconceptions
That more omega 3 works faster: above the doses the trials used there is no extra effect, only more side effects. That the front of the bottle states the dose: read the per capsule figure and the serving size on the back. That the NHS figure is a toxic threshold: it is the level below which harm is unlikely, which is a different thing.
Sources
- National Institutes of Health Office of Dietary Supplements. NIH Office of Dietary Supplements — Omega-3 Fatty Acids Health Professional Fact Sheet. NIH Office of Dietary Supplements (US government).
- UK NHS. Fish and shellfish — NHS Live Well. NHS UK (UK government).
- European Food Safety Authority 2012. EFSA Scientific Opinion on the Tolerable Upper Intake Level of EPA, DHA and DPA. European Food Safety Authority (EFSA, EU regulatory).