In Part 1, we shared how fish oil—packed with omega-3 fatty acids like EPA and DHA—supports your heart, reduces inflammation, and helps your joints recover. But that’s only half the story. Fish oil also plays a powerful role in keeping your brain sharp and your mind resilient.

DHA makes up more than 90% of the omega-3 fats in the brain and is vital for keeping brain cells healthy and communicating well. For athletes, this means improved focus, quicker decision-making, and faster reaction time. In fact, a 2021 study in Nutrients found that DHA supplementation improved mental performance in athletes under pressure.

Omega-3s also help protect mental health. Training demands, injury recovery, and performance stress can take a toll. A 2019 meta-analysis in Translational Psychiatry showed that EPA-rich omega-3s reduced symptoms of depression and improved overall mood in both athletes and the general population.

So how much should you take? Most research suggests between 1,000 and 3,000mg of combined EPA and DHA daily, depending on your body size and training load. A developing athlete training five to six days per week may benefit from about 2,000mg per day. The best approach is to work with a sports nutritionist or healthcare provider to find the right fit for you.

Quality matters, too. Choose supplements that are third-party tested for purity and potency, with at least 500mg of EPA and DHA per serving and no heavy metals. And remember: food comes first. Adding salmon, sardines, or mackerel to your meals two or three times per week is one of the easiest ways to naturally boost omega-3 intake.

When combined with smart training and recovery strategies, fish oil gives athletes a real edge—supporting both the body and the mind.