Omega-3 Fish Oil
Also known as: Fish Oil, EPA/DHA, Omega-3 Fatty Acids, Marine Omega-3
Omega-3 fatty acids are essential polyunsaturated fats that your body cannot make on its own. The two most important omega-3s found in fish oil are EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid). They play critical roles in brain function, heart health, and reducing inflammation throughout the body.
Benefits
Strong evidence for cardiovascular benefits: lowers triglycerides, may reduce blood pressure, and decreases risk of heart attack and stroke. Supports brain health and cognitive function. DHA is critical for fetal brain and eye development during pregnancy. Anti-inflammatory properties may help with joint pain and rheumatoid arthritis. May support mental health — some evidence for reducing symptoms of depression.
Recommended Dosage
General health: 250–500 mg combined EPA/DHA daily. Heart health: 1,000 mg EPA+DHA daily. High triglycerides: 2,000–4,000 mg EPA+DHA daily (prescription strength, under medical supervision). AHA recommends eating fatty fish at least twice per week. Take with a meal containing fat for best absorption.
Food Sources
Fatty fish: salmon, mackerel, sardines, herring, anchovies, trout, tuna (especially albacore). Plant sources of ALA omega-3 (converted to EPA/DHA at low rates): flaxseed, chia seeds, walnuts, hemp seeds, canola oil, soybean oil.
Side Effects
Common: Fishy aftertaste or burping, mild nausea, loose stools, rash. High doses (>3,000 mg/day): Increased bleeding risk, may affect immune function, possible increase in LDL cholesterol. Enteric-coated or molecularly distilled products may reduce fishy taste. Take with meals to minimize GI effects.
Interactions
Blood thinners (warfarin, aspirin, clopidogrel) — increased bleeding risk. Blood pressure medications — may enhance blood-pressure-lowering effect. Orlistat — may reduce omega-3 absorption. High doses may affect blood sugar control in diabetics. Contraceptive drugs — may reduce some triglyceride-lowering effects.
Warnings
People with fish or shellfish allergies should consult their doctor before taking fish oil supplements. High doses (>3 g/day) may increase bleeding risk and should only be used under medical supervision. Choose products tested for mercury, PCBs, and dioxins. Those scheduled for surgery should discuss fish oil use with their surgeon.
Deficiency Symptoms
Dry, flaky skin, brittle nails and hair, poor concentration and brain fog, fatigue, joint pain and stiffness, mood swings and depression, poor immune function, vision problems (especially in children). True omega-3 deficiency is uncommon but suboptimal intake is very common.
Frequently Asked Questions
What are the benefits of Omega-3 Fish Oil?▼
Strong evidence for cardiovascular benefits: lowers triglycerides, may reduce blood pressure, and decreases risk of heart attack and stroke. Supports brain health and cognitive function. DHA is critical for fetal brain and eye development during pregnancy. Anti-inflammatory properties may help with joint pain and rheumatoid arthritis. May support mental health — some evidence for reducing symptoms of depression.
What is the recommended dosage for Omega-3 Fish Oil?▼
General health: 250–500 mg combined EPA/DHA daily. Heart health: 1,000 mg EPA+DHA daily. High triglycerides: 2,000–4,000 mg EPA+DHA daily (prescription strength, under medical supervision). AHA recommends eating fatty fish at least twice per week. Take with a meal containing fat for best absorption.
What foods contain Omega-3 Fish Oil?▼
Fatty fish: salmon, mackerel, sardines, herring, anchovies, trout, tuna (especially albacore). Plant sources of ALA omega-3 (converted to EPA/DHA at low rates): flaxseed, chia seeds, walnuts, hemp seeds, canola oil, soybean oil.
What are the side effects of Omega-3 Fish Oil?▼
Common: Fishy aftertaste or burping, mild nausea, loose stools, rash. High doses (>3,000 mg/day): Increased bleeding risk, may affect immune function, possible increase in LDL cholesterol. Enteric-coated or molecularly distilled products may reduce fishy taste. Take with meals to minimize GI effects.
What are the symptoms of Omega-3 Fish Oil deficiency?▼
Dry, flaky skin, brittle nails and hair, poor concentration and brain fog, fatigue, joint pain and stiffness, mood swings and depression, poor immune function, vision problems (especially in children). True omega-3 deficiency is uncommon but suboptimal intake is very common.
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Supplement Disclaimer
This supplement information is for educational purposes only and should not replace professional medical advice. Dietary supplements are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a healthcare provider before starting any supplement, especially if you are pregnant, nursing, taking medications, or have a medical condition.