Omega-3 EPA Unit Converter

Eicosapentaenoic acid (EPA) is a long-chain omega-3 polyunsaturated fatty acid found primarily in fatty fish and seafood. When measured as a percentage, EPA reflects the proportion of this fatty acid relative to total fatty acids in your red blood cell membranes.

EPA is considered an essential nutrient because the body cannot produce adequate amounts on its own. While the body can convert small amounts of alpha-linolenic acid (ALA) from plant sources into EPA, this conversion is inefficient (typically less than 15%), making dietary intake from fish or supplements the primary way to maintain healthy levels.

EPA is often measured alongside DHA (docosahexaenoic acid) as part of the Omega-3 Index, which expresses the combined percentage of EPA and DHA in red blood cells. Measuring EPA as a percentage provides insight into long-term omega-3 status, as red blood cell membranes reflect intake over the previous 3-4 months.

EPA comes primarily from dietary sources, especially cold-water fatty fish such as salmon, mackerel, sardines, herring, and anchovies. The body can convert small amounts from plant-based alpha-linolenic acid (ALA) found in flaxseed, chia seeds, and walnuts, but this conversion is limited.