21st Century Alaska Wild Fish Oil has the best concentration of Mega Omega-3, naturally obtainable from fish oil. Mega Omega-3 fatty acids help maintain a healthy heart, joints, skin, memory and brain. This product comes from cold-water deep sea fish that are not farm raised. 21st Century uses an exclusive process to preserve whole-oil Omega-3 concentrations. It's molecularly distilled and naturally stable with antioxidants, which prevents rancidity. Enteric-coated softgels to prevent reflux and fish burps.