From the new PEERtrainer Guide To Building Muscle
Fish oil is also an important supplement to consider. 4 g of fish oil given for 6 weeks significantly improved lean body mass (muscle) and improved resting metabolic rate in healthy exercising subjects ages 18-55.
Fish oil will also reduce inflammation and is difficult to get in sufficient amounts from the modern diet without also risking mercury toxicity. A high-quality fish oil supplement provides all the benefits without any associated risk of heavy metal toxicity.