Find your optimal dose

Omega‑3
Calculator

Personalized EPA and DHA targets based on your health goals and cardiovascular risk.

Dosing guide

Practitioner-selected

My Recommended Omega-3 Protocols

Chosen for quality, bioavailability, and therapeutic EPA and DHA levels. Every product on this list meets the purity and potency standards I apply when recommending Omega-3s to my own patients.

View Recommended Omega-3 Options

Free to join Fullscript · No subscription · 20% off retail pricing

Omega-3s are essential fats your body can’t make on its own, so you need to get them from food (like fatty fish) or supplements. EPA and DHA help build healthy cell membranes and support heart and blood-vessel function, with research showing benefits for triglycerides and inflammatory balance; DHA also plays a key role in brain and eye development, especially during pregnancy and breastfeeding. If you don’t eat fish regularly, thoughtfully chosen omega-3 supplements can help you meet evidence-based daily amounts.

FAQs about Omega-3 Supplementation

What’s the difference between EPA and DHA?

EPA is often linked to cardiometabolic and anti-inflammatory effects. Some event-reduction data come from EPA-only, high-dose trials in higher-risk patients. New England Journal of Medicine

DHA is a structural omega-3 concentrated in the brain and retina and is commonly emphasized during pregnancy and lactation for fetal/infant development (via food or supplements within pregnancy-safe guidance). Office of Dietary Supplements
Both lower triglycerides; optimal dose and balance depend on goals and medical context.

Can I just eat fish instead of supplementing?

Yes, but be choosy. Many fish are great sources of EPA+DHA, yet several popular species carry high methylmercury, especially larger predatory fish (e.g., shark, swordfish, king mackerel, tilefish, bigeye tuna, marlin). For a simple, credible “low-mercury vs. avoid” list, use the official FDA/EPA chart and pick from the Best Choices column most of the time. U.S. Food and Drug Administration

Supplements can help you hit evidence-based EPA+DHA targets without mercury exposure. Unlike seafood, high-quality professional-grade Omega-3 supplements are purified and independent analyses have measured negligible mercury in fish-oil products.

Can I rely on this calculator instead of professional guidance?

Use the calculator as education, not diagnosis or treatment. It summarizes research-based dosing ranges for common goals and flags safety considerations, but it doesn’t replace medical advice. For example, prescription-strength omega-3s (used for very high triglycerides) and high-dose strategies require clinician oversight; major cardiology guidance places these therapies in a medical care pathway. AHJournals

How do I read omega-3 labels?

Ignore “total fish oil.” Add EPA + DHA per serving to get the true omega-3 dose. Typical OTC softgels provide ~300–600 mg EPA+DHA each.

What’s the Omega-3 Index and do I need it?

t’s a lab % of EPA+DHA in red blood cells; many aim for ≥8%. It’s optional but if you don’t track labs, daily mg guidance is a practical alternative.

How do I choose a high quality omega-3 supplement. Which is best?

Choose third-party verified products (e.g., USP Verified, NSF Certified for Sport, or IFOS certified) to reduce risk of contaminants and oxidation; these programs test identity, potency, and impurities. Algal oil is a fish-free option that provides DHA (some products also include EPA).

Is fish-oil safe? Any situations where I should talk to a clinician first?

Most adults tolerate typical supplemental amounts, but talk to your healthcare professional before using higher doses or if you have medical conditions.
Situations to get personalized guidance:

  • You take blood thinners or antiplatelet drugs, are pregnant, or manage complex conditions—drug–nutrient interactions and individualized dosing matter.
  • You’re considering ≥3 g/day total EPA+DHA (higher doses can affect bleeding risk and may suppress immune response in some contexts).
  • You have a history/risk of atrial fibrillation—regulators in Europe list AFib as a dose-related risk for omega-3 ethyl esters, most pronounced at 4 g/day. AIFA
What about vegan algae sources of omega-3?

Algal oils provide DHA (and sometimes EPA) directly—useful if you don’t eat fish. Evidence indicates algal long-chain omega-3s are bioavailable and raise blood EPA/DHA similarly to fish oil. Note that plant ALA sources (flax, chia, walnuts) don’t reliably convert to DHA/EPA in meaningful amounts for many people. Lippincott Journals

References & Resources

Core Calculation Sources

  • Siscovick DS, et al. Omega-3 Polyunsaturated Fatty Acid (Fish Oil) Supplementation and the Prevention of Clinical Cardiovascular Disease: A Science Advisory From the American Heart Association. Circulation. 2017;135(15):e867–e884. Available at: https://pubmed.ncbi.nlm.nih.gov/28289069/
  • Skulas-Ray AC, et al. Omega-3 Fatty Acids for the Management of Hypertriglyceridemia: A Science Advisory From the American Heart Association. Circulation. 2019;140(12):e673–e691. Available at: https://pubmed.ncbi.nlm.nih.gov/31422671/

Cardiovascular Health

  • Mozaffarian D, Wu JHY. Omega-3 fatty acids and cardiovascular disease: Effects on risk factors, molecular pathways, and clinical events. J Am Coll Cardiol. 2011;58(20):2047–2067. Available at: https://pubmed.ncbi.nlm.nih.gov/22051327/
  • Abdelhamid AS, et al. Omega-3 fatty acids for the primary and secondary prevention of cardiovascular disease. Cochrane Database Syst Rev. 2020;3:CD003177. Available at: https://pubmed.ncbi.nlm.nih.gov/32114706/

Brain, Mood & Development

Pregnancy & Women’s Health

Vegan & Algae-Based Sources

  • Arterburn LM, et al. Algal-oil capsules and cooked salmon: Nutritionally equivalent sources of DHA. J Am Diet Assoc. 2008;108(7):1204–1209. Available at: https://pubmed.ncbi.nlm.nih.gov/18589030/
  • Lane K, et al. Bioavailability and potential uses of vegetarian sources of omega-3 fatty acids: A review of the literature. Crit Rev Food Sci Nutr. 2014;54(5):572–579. Available at: https://pubmed.ncbi.nlm.nih.gov/24261532/

Further Reading (PubMed)

Lab Testing

Want to know your actual omega-3 status?

Dietary intake estimates only tell part of the story. A fatty acid panel measuring EPA, DHA, and your omega-6/omega-3 ratio gives you a precise, actionable baseline — including an inflammation marker your standard labs likely aren’t checking.

Explore Wellness Lab Journeys
Dr. Linda Nykin ND, CFMP

About the creator

Dr. Linda Nykin ND, CFMP

Dr. Linda Nykin is a Licensed Naturopathic Doctor and Certified Functional Medicine Practitioner, and the Founder of Pacha Integrative and Naturopathic Medicine in Berkeley, California. She specializes in women’s health, gut health, hormone balance, combining evidence-based medicine with a root-cause, integrative approach to care.

Learn more about my practice

Our tools

Committed to Quality

Every calculator is built on clinical expertise and real-world practice.

Doctor Created

Built by a licensed naturopathic doctor and certified functional medicine practitioner.

Evidence Based

Every recommendation is grounded in peer-reviewed research and clinical guidelines.

Clinically Tested

Dosing guidance reflects real-world clinical practice, not one-size-fits-all estimates.

Explore More Tools

Scroll to Top