Lash serums are used to get longer, fuller eyelashes and can also be used on your eyebrows to make them fuller. Lash serums make eyelashes and eyebrows more durable, and once you apply mascara you don't have to use as much of the product to get a good result. A good serum also accelerates the production of new eyelashes. We have some of the best brands on the market, such as Xlash, Everlash and IsaDora.