If you're trying to decide whether or not to take a fish oil supplement, perhaps you could start by looking into salmon oil, as it's shown to pack the most omega-3 fatty acids. Revealing Omega-3 fatty acids are key for optimal health. As Sydney Greene, MS, RD explained to Eat This, Not That! in a previous article on the difference between omega-3, -6, and -9 fatty acids, "Omega-3s make up the structure of cells in our body. We also need them for hormone production, immune function, and heart and lung support," she said.…