The Mary Kay serum does seem to keep the lashes from falling out frequently. So they will get thicker if you've never used any lash enhancer. But if you're used to the length you get from Latisse, the serum will fall short. The other thing you should know is that you can use Latisse and/or Lumigan to grow your eyebrows in more fully, too. Use the brush and paint on your brows where you want them to be thicker. bimatoprost eye drops 0.01% group from baseline 4.7±3.8 to 2.9±2.3 (P