It does both for me. My eyelashes are pretty short and thin. But honestly you have to try it. When it comes to mascaras and foundations we all have different needs, reactions, skin type, lashes.. etc. Maybelline is my favorite brand for mascaras but others hate it. Another that I really like but hated is the L'oreal Carbon Black. It's soooo black and WOW but it dried out fast and got little black dots all over my face.