Taking 900 IU of vitamin E daily for six weeks raises levels of vitamin E in the blood of healthy adult men, but it does not lower the increase in certain oxidative stress markers caused by taking omega-3 fatty acids at the same time.

We analyzed the available evidence and found that taking 900 IU of vitamin E daily for six weeks increases vitamin E levels in the blood of healthy adult men [1]. However, the same evidence shows this dose does not reduce the rise in certain oxidative stress markers that occur when omega-3 supplements are taken at the same time [1]. What we’ve found so far suggests that while vitamin E supplementation at this level effectively raises plasma concentrations — meaning more of the vitamin is present in the bloodstream — it does not appear to counteract the oxidative stress signals triggered by omega-3 intake. Oxidative stress refers to an imbalance between free radicals and the body’s ability to neutralize them, which can occur during normal metabolic processes or when introducing new supplements like omega-3s. The evidence does not indicate that vitamin E at 900 IU acts as a protective buffer against this specific effect. There are no studies in our review that contradict these findings, but the number of assertions analyzed is limited to just one. We cannot say whether longer use, different doses, or variations in population (like women or older adults) would change the outcome. The evidence we’ve reviewed leans toward the idea that vitamin E and omega-3s may interact in ways that aren’t fully resolved by this single observation. If you’re taking omega-3 supplements and considering vitamin E to manage oxidative stress, this analysis suggests that 900 IU daily may raise your vitamin E levels but likely won’t reduce the oxidative signals from omega-3s.