Omega-3s: The Essential Fatty Acids You Need to Know Looking for natural ways to improve your heart health and brain function? Try boosting your intake of omega-3 fatty acids, also known as fish oil. Omega-3s are abundant in fatty fish and algae and are also found in several seeds like flaxseeds, chia seeds, and walnuts. Omega-3s are also available in food supplements. If you're in Singapore, try organic omega-3 supplements or fish oil supplements to start reaping the various health benefits of these essential fatty acids.