Taking omega-3 supplements might help prevent muscle loss when you're stuck in bed or not moving much, like after an injury, by keeping your muscles from breaking down too fast.

Taking omega-3 supplements might help your muscles grow better when you eat protein or work out, especially if you're sick or have a medical condition—but it doesn't always work for healthy people.

Taking omega-3 supplements might help muscle health more in people who are losing muscle due to illness or aging than in healthy people, but it’s not certain how much better it is.

Taking omega-3 fatty acids might help your muscle cells work better and stay healthier as you age or if you're inactive, but it doesn't reliably make your muscles grow or repair faster.

Taking omega-3 fatty acids might help reduce harmful stress in muscle cells, especially as we age or if we're sick, and this could help muscles stay stronger and work better — but this has only been seen in animal or lab studies so far.

Taking a small amount of fish oil every day for three years doesn't seem to make older adults who don't exercise any stronger.