Taking 4 grams per day of a combination of EPA and DHA omega-3 fatty acids for 52 days in healthy young men does not clearly improve muscle recovery after exercise better than taking EPA or DHA alone, and might reduce the performance improvements seen with either fatty acid by itself.

Taking 4 grams of DHA daily for 52 days may reduce muscle soreness after intense exercise as much as EPA, but it does not improve muscle strength or power recovery as effectively as EPA.

Taking EPA and DHA supplements in structured triglyceride or mixed forms for eight weeks does not make healthy young men stronger or less fatigued during weight training, even though their blood levels of EPA relative to AA increase.

Taking 4 grams daily of EPA or DHA omega-3 supplements for 52 days may help healthy young men with low omega-3 levels recover faster after intense exercise, reducing muscle soreness and maintaining leg strength, with EPA potentially offering better improvements in explosive power than DHA or a placebo.

In healthy young men, taking 4 grams of EPA daily for 52 days may help maintain explosive leg power after intense exercise that causes muscle damage, compared to taking DHA or a placebo.

Taking fish oil supplements with EPA and DHA every day may lower your chances of having a heart attack, and the more you take (up to 6 grams), the more your risk goes down—about 9% less for each extra gram.