Omega-3 is a kind of polyunsaturated fatty acid which is usually seen in abyssal fishes and some plants. Omega-3 is very good for the health if human beings because it can help discharge cholesterol, restrain the synthesis of intrahepatic lipid and lipoprotein, and decrease the amount of cholesterol in the blood plasma. Therefore, omega-3 can be used in the treatment of hyperlipaemia, atherosclerosis, and coronary disease. However, omega-3 can not be much helpful to make the eyelashes grow longer or better. If you want to make your eyelashes grow better and longer, you can use oliver oil by spreading it on the eyelashes, which can be very effective. Also, you can add some vitamin E into the oliver oil and mix them, then spread the mixture on the eyelashes. Do it every day and one or two times a day.