Omega-3 for the heart: how much EPA/DHA is needed to protect blood vessels

Omega-3 and the heart: what has really been proven

Omega-3 is one of the few supplements with a strong cardioprotective evidence base. Not “may be useful,” but proven to reduce specific markers of cardiovascular risk in dozens of meta-analyses.

But there is a nuance: not all omega-3s are the same for the heart. EPA and DHA do different things, and their ratio matters for cardioprotection.

EPA vs DHA: which is more important for the heart

EPA is the main cardioprotector

For the heart and blood vessels, EPA is more important than DHA. Here's why:

• Reduced triglycerides:EPA is the main component responsible for reducing triglycerides by 15-30%
• REDUCE-IT Study (2019, 8179 participants): 4 g of pure EPA (ichosapent ethyl) reduced cardiovascular events by 25% - heart attack, stroke, cardiac death
• Stabilization of atherosclerotic plaques:EPA reduces inflammation in the vessel wall and makes plaques less prone to rupture
• Antiarrhythmic effect:stabilizes the electrical activity of cardiomyocytes

DHA - structural support

DHA is a component of heart cell membranes. It ensures their elasticity and proper functioning of ion channels. However, in high doses, DHA can slightly increase LDL (bad cholesterol), which is undesirable for heart disease.

Conclusion: For cardioprotection, choose supplements with an EPA:DHA ratio of at least 2:1.

Five proven effects for the heart

1. Reduced triglycerides

The most powerful and reproducible effect. Meta-analysis of 68 RCTs: Doses of 2-4 g EPA+DHA reduce triglycerides by15-30%. For very high triglycerides (500+ mg/dL), the reduction can be up to 45%.

2. Reduced blood pressure

Meta-analysis of 70 RCTs (4489 participants): Omega-3 reduces systolic blood pressure by 2-4 mmHgand diastolic blood pressure by 2-3 mm. The effect is stronger in hypertensive patients. Does not replace medications, but is a good addition.

3. Antiarrhythmic effect

EPA and DHA are embedded in the membranes of cardiomyocytes and stabilize electrical activity. The risk of atrial fibrillation and ventricular arrhythmias is reduced.

4. Improvement of endothelial function

Endothelium is the inner lining of blood vessels. Healthy endothelium produces nitric oxide (NO), which dilates blood vessels. Omega-3 improves NO production and reduces vascular stiffness.

5. Reduced inflammation

EPA is a precursor of resolvins and protectins - molecules that actively resolve inflammation. A decrease in C-reactive protein and interleukin-6 has been proven in dozens of studies.

What doses for what purpose

Prevention (healthy people)

1000 mg EPA+DHA per day. One serving of quality supplement. Covers the basic needs of the heart and brain.

Elevated triglycerides

2000-4000 mg EPA+DHA per day(necessarily under medical supervision). These are therapeutic doses. Monitor your lipid profile every 3 months. At these doses, the effect is comparable to fibrates.

After a heart attack / IHD

1500-2500 mg EPA+DHA per day. Focus on EPA (EPA:DHA ratio 2:1 or higher). An addition to the main therapy is not a replacement for statins and antiplatelet agents.

Hypertension

1500-2000 mg/day. The effect on blood pressure develops after 8-12 weeks. Does not replace antihypertensive drugs, but may allow you to reduce their dose (only with a doctor!).

How to take it correctly for the heart

• With fatty foods - EPA/DHA absorption increases 3 times
• Divide the dose - more than 2 g at a time are less easily absorbed. Morning + evening
• Triglyceride form (TG) - digestibility is 70% higher than ether form (EE)
• IFOS 5 stars - guarantee of purity from mercury and PCB
• Store in the refrigerator after opening
• Effect on triglycerides: evaluate after 8-12 weeks

Safety in heart disease

• Anticoagulants (warfarin, clopidogrel): EPA has a mild anticoagulant effect. Up to 3 g/day is safe, higher - INR monitoring
• Statins: Omega-3 goes well with statins. Statins lower LDL, omega-3 lowers triglycerides - work on different fronts
• Before surgery: Stop taking 7 days before (mild blood thinning)
• Atrial fibrillation: There is evidence that very high doses (4+ g) can provoke AF in susceptible individuals. Discuss with a cardiologist

Resume from Novird

Omega-3 is the only supplement proven to reduce cardiovascular events in large RCTs. For cardioprotection, choose supplements with high EPA, triglyceride form, and IFOS certification.

Important: At doses above 2000 mg/day, omega-3 is a therapeutic agent, and not just a dietary supplement. Always discuss such doses with your cardiologist and monitor your lipid profile.