This is the question everyone actually wants answered, and most sources answer it with a number that has no source of its own. This article gives you the figures we work with, splits them into what is published, what is our own house rule, and where a doctor belongs in the loop, and stops exactly where the evidence stops.
A note up front : this article is educational and does not replace medical advice. It reports the target value and the intake figures we use, not a prescription. Anyone considering more than about one gram a day, anyone on anticoagulant medication, anyone with a current or past rhythm disturbance, and anyone pregnant or breastfeeding belongs in a conversation with a doctor before changing anything.
The target : from 8 percent, corridor up to 11
An open threshold, not a blank cheque upwardThe threshold comes from the paper that introduced the omega-3 index, and it is worth quoting exactly because it usually gets misquoted : an index of 8 percent or above was associated with the greatest cardioprotection, one of 4 percent or below with the least (Harris and von Schacky, Prev Med 2004, PMID 15208005). That reads as a floor, not a span. So the traffic-light logic we use is : green from 8 percent, amber between 4 and 8, red below 4.
Where the literature does give a range, it stops at 11 percent, not at 12 (von Schacky, Nutrients 2014;6(2):799-814, and Proc Nutr Soc 2020;79(4):381-387, both explicitly naming the target range as 8 to 11 percent). Above roughly 11 percent, an additional benefit has not been examined. That is a statement about the state of the research, not a claim that nothing more happens up there.
Why not 12, which you will find almost everywhere else : the figure 12 has no primary source we could locate. It circulates through the communication of commercial laboratories that sell the test, not through peer-reviewed work. We checked this on 05 August 2026 and corrected our own older material accordingly, the same way we corrected the vitamin D corridor from 40-60 to the figure the guidelines actually support.
The dose, split into three figures
Total, DHA and EPA are not the same numberThe European Food Safety Authority has expressly not set a single tolerable upper intake level for these fatty acids. Instead it names separate figures for supplemental intake in adults, on top of the diet. Reading only the total misses the point : a DHA-heavy algae oil can exceed the DHA figure well before the total looks remarkable, because the Authority's ceilings apply per fatty acid, not per bottle.
| Figure | Value | Source |
|---|---|---|
| Total ceiling | 2.5 g per day | In-house ceiling, not a primary source. Sits below the 5 g that EFSA regards as raising no concern for EPA plus DHA combined. |
| of which DHA at most | 1.0 g per day | EFSA Journal 2026;24(1):e9858 |
| of which EPA at most | 1.8 g per day | EFSA Journal 2012;10(7):2815 |
| From this amount, discuss with a doctor first | 1.0 g per day | Gencer B et al., Circulation 2021 : atrial fibrillation risk rises with dose |
The 2.5 g total and the 1.0 g doctor threshold serve different purposes and both stay in place : the ceiling is where we say stop, the threshold is where a doctor joins the decision. Neither weakens the other, and neither weakens the caution from our companion article about atrial fibrillation risk.
From a low reading to the threshold : the route runs through a doctor's appointment
Not around itWestern populations sit at an omega-3 index of roughly 5 percent on average. An estimate of how intake moves the index puts reaching about 8 percent at roughly 2 grams a day (Walker et al., Am J Clin Nutr 2019, PMID 31396625). That figure sits below our 2.5 g ceiling, but well above the 1.0 g mark from which we say a doctor belongs in the decision. So for most people starting from a typical Western baseline, closing the gap to the threshold is not a decision you make alone with a supplement bottle : it runs through exactly the conversation this article keeps pointing you to.
The atrial fibrillation signal named above rises with dose in a pooled analysis of randomised outcome trials (Gencer et al., Circulation 2021, PMID 34612056), so there is no window below which more is automatically harmless and no upper end beyond which it becomes safe again. This matters in particular alongside anticoagulant medication, ahead of planned surgery, and for anyone with a current or past rhythm disturbance : that question belongs with the doctor managing the treatment, not with this article. Anyone already taking more than one gram a day should raise continuing it at the next regular appointment rather than deciding alone.
What expressly does not hold
Named so it cannot quietly creep back inAn optimal ratio of EPA to DHA. No source establishes one, and figures circulating for it are not ours to repeat.
"EPA lowers triglycerides more than DHA." This is not established : a head-to-head comparison found DHA lowered triglycerides by about 20 percent against roughly 18 percent for EPA, essentially the same effect. What is established is that DHA raises LDL cholesterol by around 8 percent and EPA does not (Mori et al., Am J Clin Nutr 2000, PMID 10799369).
The figure "8 to 12 percent" as it appears on lab reports from commercial providers, as a citation. It is a communication choice by those laboratories, not a peer-reviewed finding, which is exactly why we no longer use it ourselves.
Conflicts of interest we carry along
Named the way we name them for vitamin DHarris is the lead author of the 2004 paper, a co-author of the dose-response work we cite above, and connected through OmegaQuant Analytics to the laboratory that runs the test the index requires. The industry association for EPA and DHA is involved in that same dose-response work. None of this makes the papers wrong. It belongs stated, the same way we state it for the higher vitamin D target range.
Know where you actually stand
The omega-3 index is one of more than 70 markers in the Longevity Check-up, read together with the others rather than on its own.
Sources (primary literature)
- Harris WS, von Schacky C (2004). The Omega-3 Index : a new risk factor for death from coronary heart disease? Prev Med 39(1):212-220. PMID 15208005
- von Schacky C (2014). Omega-3 Index and cardiovascular health. Nutrients 6(2):799-814.
- von Schacky C (2020). Omega-3 index in 2018/19. Proc Nutr Soc 79(4):381-387.
- EFSA Panel on Nutrition, Novel Foods and Food Allergens (2026). Safety of docosahexaenoic acid (DHA) for the proposed uses as a novel food / re-evaluation of safety of supplemental intake. EFSA Journal 24(1):e9858. doi 10.2903/j.efsa.2026.9858
- EFSA Panel on Dietetic Products, Nutrition and Allergies (2012). Scientific opinion on the tolerable upper intake level of eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA) and docosapentaenoic acid (DPA). EFSA Journal 10(7):2815. doi 10.2903/j.efsa.2012.2815
- Gencer B et al. (2021). Effect of long-term marine ω-3 fatty acids supplementation on the risk of atrial fibrillation : an updated meta-analysis of randomized controlled trials. Circulation 144(25):1981-1990. PMID 34612056
- Walker RE et al. (2019). Predicting the effects of supplemental EPA and DHA on the omega-3 index. Am J Clin Nutr 110(4):1034-1040. PMID 31396625
- Mori TA et al. (2000). Purified eicosapentaenoic and docosahexaenoic acids have differential effects on serum lipids and lipoproteins, LDL particle size, glucose, and insulin in mildly hyperlipidemic men. Am J Clin Nutr 71(5):1085-1094. PMID 10799369
This article is educational and does not replace medical advice. StoaVita provides longevity and performance coaching, not medical treatment, and gives no individual dosing prescriptions. Anyone considering more than about one gram of EPA and DHA a day, anyone on anticoagulant medication, anyone with a current or past rhythm disturbance, and anyone pregnant or breastfeeding should speak to their doctor before changing anything. Anyone already taking more should not change it in either direction on their own while under medical treatment.