Fish oil is one of the most popular supplements in the country. Adults take them regularly, trying to get some of the same heart-healthy nutrients found in fish, like salmon. 

Fish oil supplements are very popular. In a national survey that CR conducted, they were among the five most popular supplements in the United States.

To take a closer look, Consumer Reports tested 20 popular fish oil supplements. The good news is that none of the products raised major safety concerns, including contamination from heavy metals or dioxins. But the testing did uncover some quality issues.

Consumer Reports health expert Catherine Roberts says a few products showed signs of rancidity, which can happen when oils degrade over time. Other supplements contained less omega-3 than their labels claimed, meaning consumers may not be getting the full benefit they’re paying for.

Some supplement makers are pushing back on the findings. Qunol questioned the testing methods used, while Nature Made said its own testing showed its products met quality standards. California Gold Nutrition said it has paused sales of certain products and is conducting additional testing, and Costco did not respond to requests for comment.

Beyond product quality, Consumer Reports also raises a broader question: do most people need fish oil supplements at all? Roberts says research suggests that omega-3s from whole foods may offer greater benefits than those taken in pill form, highlighting the importance of diet over supplementation.

For most people, Consumer Reports recommends getting omega-3s the natural way—by eating fish such as salmon or sardines a couple of times a week. If you do choose to take fish oil supplements, proper storage is key. Like any oil, they can go bad over time, which may affect both quality and effectiveness.

While fish oil supplements are often marketed for a wide range of health benefits—from heart health to conditions like ADHD, asthma, and allergies—Consumer Reports says the scientific evidence supporting many of those claims remains inconclusive.

Met CR’s Safety and Quality Standards

365 Whole Foods Market — 100% Wild-Caught Fish Oil Softgels 1000 mgBarlean’s Organic Oils — Fresh Catch Fish Oil Softgels, Orange FlavorCVS Health — 100% Wild Alaskan Fish Oil Softgels 1000 mgGNC — Triple Strength Fish Oil Softgels 1000 mgLil Critters — Omega-3 Supplement GummyMicro Ingredients — Triple Strength Omega-3 Fish Oil SoftgelsNature’s Bounty — Fish Oil Softgels 1200 mgPure Alaska — Omega Wild Alaskan Salmon Oil Softgels 1000 mgSports Research — Omega-3 Fish Oil Triple Strength SoftgelsThe Vitamin Shoppe — Omega-3 Fish Oil SoftgelsViva Naturals — Triple-Strength Omega-3 Fish Oil Softgels 2500 mg

Met Standards but Could Not Be Assessed for Rancidity

Best Nest Wellness Mama Bird — Prenatal DHA Triglyceride Fish Oil SoftgelsMegaRed Advanced — 4 in 1 Omega-3 Fish & Krill Oil Softgels 900 mgNordic Naturals — Children’s DHA Softgels, StrawberryNordic Naturals — Prenatal DHA SoftgelsSpring Valley (Walmart) — Proactive Support Omega-3 Mini Softgels 1000 mg

Did Not Meet CR’s Quality Standards

California Gold Nutrition — Kids Omega-3 Fish Oil Softgels, StrawberryKirkland Signature (Costco) — Fish Oil Softgels 1000 mgNature Made — Burp-Less Fish Oil Softgels 1000 mgQunol Ultra — Omega-3 Mini Softgels 1000mg