Why Exactly 250 mg?
Docosahexaenoic acid (DHA) is an omega-3 fatty acid that makes up to 40% of the polyunsaturated fatty acids in the brain cortex and 60% of the retina's fatty acids. The European Food Safety Authority (EFSA) has confirmed that 250 mg of DHA per day contributes to the maintenance of normal brain function — one of the few supplement claims EFSA has approved (EFSA, 2010).
This 250 mg is not an arbitrary number. It is the minimum below which studies have not observed a protective effect, confirmed repeatedly in meta-analyses (Mozaffarian & Wu, 2011).
Who This Guide Is For
People who want to understand whether their DHA intake is adequate and how to increase it if needed. Especially important for those who eat little fish.
TL;DR
- 250 mg DHA per day is the EFSA-approved minimum for brain function
- The same dose also supports normal heart function and vision (EFSA, 2010)
- Most Europeans don't consume enough DHA from food (Swanson et al., 2012)
- Best sources: fatty fish (salmon, mackerel, herring) and algae oil
- A supplement makes sense if you eat fish less than 2x per week
- Triglyceride and phospholipid forms absorb better than ethyl esters
DHA's Three EFSA-Approved Roles
EFSA has approved the following claims for 250 mg DHA per day (EFSA, 2010):
1. Normal brain function — DHA is a structural component of brain cell membranes and supports neurotransmitter function (Innis, 2007)
2. Normal vision — DHA makes up a large part of the photoreceptor membranes in the retina (SanGiovanni & Chew, 2005)
3. Normal heart function — combined with EPA (total 250 mg DHA+EPA) supports heart health (Mozaffarian & Wu, 2011)
Important: these are official, EFSA-approved health claims that manufacturers may legally use in Europe.
Are You Getting Enough DHA?
The typical Western diet provides only 100-150 mg of DHA per day, below the EFSA recommendation (Swanson et al., 2012). In the Estonian context, the situation is better than in some other European countries — herring and sprats are a traditional part of the diet — but not sufficient if you don't eat fish regularly.
| DHA Source | DHA Content | How Much Needed |
|---|---|---|
| Salmon (100g) | 1,200-2,000 mg | 1 serving covers 5-8 days |
| Mackerel (100g) | 1,000-1,400 mg | 1 serving covers 4-6 days |
| Herring (100g) | 900-1,200 mg | 1 serving covers 4-5 days |
| Sardines (100g) | 500-800 mg | 1 serving covers 2-3 days |
| Tuna (100g) | 200-400 mg | 1 serving covers 1-2 days |
| Egg (1, regular) | 20-40 mg | 6-12 eggs per day |
| Omega-3 egg (1) | 100-150 mg | 2-3 eggs per day |
Rule of thumb: If you eat fatty fish at least twice a week, you likely get enough DHA. If less — a supplement makes sense.
How to Choose a DHA Supplement
Form Selection
| Form | Bioavailability | Price | Notes |
|---|---|---|---|
| Triglyceride (TG) | High | €€ | Natural fish oil form |
| Phospholipid (krill) | Very high | €€€ | Best absorption, most expensive |
| Ethyl ester (EE) | Lower | € | Cheapest, needs to be taken with food |
| Algae oil (vegan) | High | €€-€€€ | Plant-based alternative |
Stonehouse et al. (2013) showed that DHA supplementation improved memory and reaction time in healthy young adults, using the triglyceride form.
What to Check on the Label
1. DHA amount per serving — ensure it is at least 250 mg of DHA (not total omega-3!)
2. Purity certificate — IFOS (International Fish Oil Standards) is the best
3. Heavy metals testing — especially mercury and PCBs
4. Expiration date — omega-3 oxidizes quickly
Common Mistakes
1. Reading "1000 mg fish oil" as DHA — 1000 mg of fish oil typically contains only 120-250 mg of DHA. Always read DHA content separately.
2. Taking ethyl esters on an empty stomach — this form needs fat for absorption. Take with food.
3. Avoiding fish oil due to fear of high doses — 250 mg is a moderate dose that is well tolerated.
4. Ignoring quality — cheap fish oil may be oxidized (high peroxide number), which does more harm than good.
Frequently Asked Questions
Is 250 mg DHA enough for athletes?
The EFSA recommendation of 250 mg is the minimum for general health. Athletes may consider higher doses (1000-2000 mg DHA+EPA), especially for anti-inflammatory effects, but this needs individual assessment.
Does DHA supplementation have side effects?
At typical doses, side effects are rare. Some people report a fishy aftertaste, more burping, or softer stools. Enteric-coated capsules reduce these issues.
Does a pregnant woman need more DHA?
Yes. EFSA recommends pregnant and breastfeeding women take 200 mg DHA in addition to the regular 250 mg, totaling 450 mg per day. DHA is critically important for fetal brain and eye development (Innis, 2007).
Is algae oil as good as fish oil?
Yes, DHA from algae oil is chemically identical to fish oil DHA. In fact, fish get their DHA from algae in the first place. Algae oil is a good choice for vegans and those concerned about fish oil contaminants.
Does DHA replace EPA?
No. DHA and EPA have different functions. DHA is primarily structural (brain, eyes), EPA is primarily functional (inflammation regulation). Ideally you consume both.
Estonia Context
In Estonia, fish oil and omega-3 supplements are widely available — Prisma, Selver, and pharmacies sell them for €8-25 per month's supply. Estonia's traditional food culture, which includes herring and sprats, is actually a good DHA source. But younger generations eat less fish, making supplementation more important. Estonia's long, dark winter also means vitamin D deficiency — fish oil capsules that include vitamin D are a two-in-one solution.
Summary
250 mg DHA is a scientifically justified and EFSA-approved minimum dose for brain, heart, and eye health. Most people who don't regularly eat fatty fish fall short of this level. A quality DHA supplement in triglyceride form, taken with food, is a simple and affordable way to fill this gap.
References
1. EFSA Panel on Dietetic Products, Nutrition and Allergies. (2010). Scientific opinion on the substantiation of health claims related to DHA. EFSA Journal, 8(10), 1734.
2. Mozaffarian D, Wu JH. (2011). Omega-3 fatty acids and cardiovascular disease: effects on risk factors, molecular pathways, and clinical events. Journal of the American College of Cardiology, 58(20), 2047-2067.
3. Swanson D, Block R, Mousa SA. (2012). Omega-3 fatty acids EPA and DHA: health benefits throughout life. Advances in Nutrition, 3(1), 1-7.
4. Stonehouse W, Conlon CA, Podd J, et al. (2013). DHA supplementation improved both memory and reaction time in healthy young adults. American Journal of Clinical Nutrition, 97(5), 1134-1143.
5. SanGiovanni JP, Chew EY. (2005). The role of omega-3 long-chain polyunsaturated fatty acids in health and disease of the retina. Progress in Retinal and Eye Research, 24(1), 87-138.
6. Innis SM. (2007). Dietary (n-3) fatty acids and brain development. Journal of Nutrition, 137(4), 855-859.
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