From fish oil to prescription omega-3s: The evolution of heart protection

Fish oil, widely known as omega-3, remains one of the most popular dietary supplements worldwide. Originally gaining attention in the 1970s, it has since been linked to benefits ranging from heart protection to mood support. Today, its uses continue to expand, backed by decades of research and growing medical approval.

Scientific interest in fish oil took off in the 1970s after studies highlighted its potential to protect heart health. By the 1980s, capsules were marketed as a simple way to consume omega-3 fats, particularly EPA and DHA—key components in cell membrane function.

The supplement is often promoted for reducing inflammation, easing joint stiffness in arthritis, and even supporting mental health. Research shows that omega-3s, especially those higher in EPA, can modestly improve symptoms of depression when combined with antidepressants. For most people, fish oil is safe, though mild side effects like a fishy aftertaste or digestive discomfort may occur.

A 2023 study found that only doses above 2 grams per day of EPA and DHA significantly lower triglycerides—a marker for heart disease risk. Yet standard over-the-counter capsules typically contain just 300 mg of these fatty acids. This gap led to the development of high-dose prescription omega-3 drugs, such as Vascepa (approved by the US FDA in 2019) and Vazkepa (cleared by the EMA in 2021). These medications are now recommended in cardiology guidelines, including the AHA/ACC 2022 update, for patients at high cardiovascular risk. Availability has since spread to Canada, Japan, and the UK, though cost and insurance coverage still limit widespread use.

Fish oil's reputation as a versatile supplement is well-established, with proven roles in heart health, inflammation, and mood regulation. While standard doses offer modest benefits, prescription-strength omega-3s now provide stronger options for those at high risk of cardiovascular disease. Access, however, remains uneven due to pricing and regional healthcare policies.