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 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.

When healthy young men take a specific form of omega-3 fatty acids bound to medium-chain triglycerides for eight weeks, their blood shows a higher ratio of EPA to arachidonic acid than when they take the same fatty acids in a simple mixed form.

Taking a high dose of omega-3 fish oil every day for three months doesn't make obese women lose weight or change their muscle or fat levels — but their metabolism and inflammation might still get better anyway.

Taking a high dose of fish oil daily for three months may help shift the balance of fats in the body of obese women toward less inflammation, but if they stop taking it, that benefit goes away within a month.

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.