Medically reviewed by Patricia Mikula, PharmDA new study found that omega-3 supplements may not prevent cognitive decline.Credit: Zbynek PospisilKey TakeawaysFish oil supplements containing omega-3s may increase brain DHA levels but do not improve memory or cognitive function.Experts caution that this study doesn’t definitively say that omega-3s are not helpful for cognitive health.Previous studies suggest that long-term use of omega-3s may help…