If you're an older adult with mild memory problems and your body doesn't have enough omega-3s, taking B vitamins won't help your memory get better. But if you do have enough omega-3s, B vitamins might help.

We analyzed the available evidence and found that B vitamins do not appear to help memory in older adults with low omega-3 levels. What we’ve found so far suggests that the effect of B vitamins on memory depends on whether omega-3 levels are sufficient [1]. In older adults who already have mild memory issues and low omega-3 levels, taking B vitamins did not lead to noticeable improvements in memory. However, when omega-3 levels are adequate, B vitamins may be associated with some benefit for memory function [1]. This pattern was supported across all the evidence we reviewed, with no studies contradicting it. The relationship isn’t about B vitamins working or not working on their own — it seems to depend on the body’s omega-3 status. We don’t know exactly how these nutrients interact, but the data points to a possible synergy. Our current analysis shows this is not a simple case of “take B vitamins and your memory improves.” Instead, it’s more about whether your body has the right foundation — in this case, enough omega-3s — for B vitamins to potentially make a difference. If you’re an older adult concerned about memory and you know your omega-3 levels are low, adding B vitamins alone may not be enough. Getting your omega-3 levels checked and addressing them first might be a more meaningful step.