Taking 6.26 grams of n−3 fatty acids from menhaden oil daily for six weeks raises the levels of EPA and DHA in the fatty components of blood cell membranes in healthy adult men.

We analyzed the available evidence and found that taking 6.26 grams of n−3 fatty acids from menhaden oil daily for six weeks is associated with an increase in EPA and DHA levels in plasma phospholipids — the fatty components of blood cell membranes — in healthy adult men [1]. This conclusion is based on one assertion that supports the claim, with no studies or data contradicting it. Plasma phospholipids are part of the structure of cell membranes and reflect recent changes in dietary fat intake. EPA and DHA are long-chain omega-3 fatty acids commonly found in fish oils, and menhaden oil is one source. The amount used — 6.26 grams per day — is higher than typical daily supplements, which often range from 1 to 3 grams. The six-week duration suggests this change occurred over a measurable, relatively short period. What we’ve found so far is limited to a single assertion, even though it is strongly supported by the data provided. There are no studies in our review that show no effect or a decrease in EPA and DHA under these conditions. However, the evidence comes from only one source, and we do not know if the same result would appear in women, older adults, or people with health conditions. We cannot say whether this increase is large, small, or clinically meaningful — only that the levels rose in the group studied. More research would be needed to understand how consistent this effect is across different populations and whether it lasts beyond six weeks. If you’re considering a high-dose omega-3 supplement like this, it’s worth noting that the dose used here is substantial. Talk with a healthcare provider before starting, especially if you’re on blood thinners or have other health concerns.