EPA vs. DHA: Structure, Sources, and Label Differences

EPA and DHA are both long-chain omega-3 fatty acids, but they are different molecules and can appear in different proportions in foods and supplements.

Molecular Structure

• EPA: eicosapentaenoic acid, 20 carbon atoms and five double bonds.
• DHA: docosahexaenoic acid, 22 carbon atoms and six double bonds.

That structural difference affects how the fatty acids are incorporated and metabolized in the body, but it does not make one a universal substitute for the other.

Common Sources

Fish and fish oil commonly provide both EPA and DHA. Microalgae can be cultivated as a direct source of DHA and, depending on the species or formulation, EPA.

Why Labels List Them Separately

Two products can contain the same total oil but different amounts of EPA and DHA. Separate milligram values allow a more precise comparison of fatty-acid composition.

EPA:DHA Ratio

The ratio is calculated from the two listed amounts, but it is only a description of composition. There is no single EPA:DHA ratio that serves as a universal quality score for every user or purpose.

Serving Size Matters

Compare EPA and DHA only after normalizing for serving size. A one-softgel product and a two-softgel product can otherwise appear more different than they really are.

Source Does Not Predict the Exact Ratio

Fish-oil formulas can be naturally derived, concentrated, or adjusted to different profiles. Algae products also vary. Always use the actual label instead of assuming an EPA/DHA balance from the source category.

Current Nutribota Omega-3

To apply the same comparison to the current Nutribota algae-oil formula, review the current serving size and labeled DHA/EPA amounts on the Nutribota Vegan Omega-3 product page.

EPA and DHA belong to the same omega-3 family, but their structure and label amounts are distinct. Read both values alongside serving size and total omega-3 information.