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Omega-3 4 min read21 October 2026

Plant-Based Omega-3: A Guide for Vegans

If you don't eat fish, can you still get enough EPA and DHA? Here's what the evidence says about plant-based omega-3.

Who this is for

Vegans, vegetarians and anyone who doesn't eat oily fish.

Key takeaways

  • 1. Plant sources of omega-3 provide ALA, which the body converts to EPA and DHA inefficiently
  • 2. The conversion rate is typically less than 5%
  • 3. Algae-based supplements provide direct EPA and DHA for vegans

If you're vegan or vegetarian, getting enough EPA and DHA is a challenge. Here's what you need to know.

Three types of omega-3

There are three main omega-3 fatty acids: ALA (alpha-linolenic acid), EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid). ALA is found in plant foods (flaxseeds, chia seeds, walnuts, hemp seeds). EPA and DHA are found mainly in oily fish.

The conversion problem

The body can convert ALA to EPA and DHA, but the conversion rate is very low — typically less than 5% for EPA and less than 0.5% for DHA. This means that even if you eat plenty of flaxseeds and walnuts, you may not be getting enough EPA and DHA.

Algae-based supplements

Algae are the original source of EPA and DHA in the marine food chain. Algae-based supplements provide direct EPA and DHA, making them suitable for vegans. The BHF acknowledges that these are an alternative to fish oil for people who don't eat fish.

Our fish oil

Our Fish Oil 1000mg is from sardine and anchovy oil and is not suitable for vegans (the capsule shell contains gelatine). If you are vegan, look for an algae-based EPA and DHA supplement. If you are vegetarian but not vegan, algae-based supplements are still the best option.

The bottom line

If you're vegan, you can get ALA from food (flaxseeds, chia seeds, walnuts), but you're unlikely to get enough EPA and DHA from diet alone. An algae-based supplement is the most reliable way to ensure adequate intake.

Food supplements should not replace a varied, balanced diet and a healthy lifestyle. This guide is general information, not medical advice. If you are pregnant, breastfeeding, take medicine or have a health condition, speak to your GP or pharmacist before taking a supplement.

Sources

  1. 1.BHF. Omega-3 fats. bhf.org.uk.
  2. 2.NHS. Vegetarian and vegan diets. nhs.uk/live-well/eat-well.
  3. 3.Davis BC, Kris-Etherton PM. Achieving optimal essential fatty acid status in vegetarians. Am J Clin Nutr, 2003.
Mentioned in this article

Fish Oil 1000mg

High Potency · 330mg EPA and 220mg DHA per capsule · 60 capsules

£15.99 · About 27p to 53p a day

Buy any 3, get 1 free, with free delivery. You pay for 2 bottles and get 3.