The human body converts only a small amount of alpha-linolenic acid (ALA) into EPA and DHA, so consuming EPA and DHA directly from food or supplements is necessary to reach levels required for normal...

We analyzed one assertion on the conversion of ALA to EPA and DHA in humans, and what we’ve found so far suggests the body converts only a small amount of ALA into these longer-chain omega-3s. This means getting EPA and DHA directly from food like fatty fish or supplements may be needed to reach levels associated with normal bodily functions [1]. The evidence we’ve reviewed doesn’t show how much ALA is converted in different people, or whether factors like age, sex, or diet affect that rate. We also don’t have data comparing how well people maintain EPA and DHA levels when they rely only on ALA versus when they consume it directly. Because only one assertion was analyzed, and no studies directly measured conversion rates in humans, we can’t say how consistent or reliable this finding is across populations. What we know so far is limited to this single point: the conversion appears inefficient enough that direct intake of EPA and DHA is often recommended to meet physiological needs. But without more research, we can’t say whether this is true for everyone, or if some people convert ALA more effectively than others. In everyday terms: if you’re trying to get enough EPA and DHA, eating flaxseeds or chia seeds alone may not be enough — you might need to include fish, algae, or supplements to be sure you’re getting what your body uses.