With an average 4.5-star rating from other shoppers, this Tarte Opening Act Lash Primer ($11-$22) is well-loved for how well it strengthens lashes with plant-based conditioners. And, not only does this product help prevent mascara from flaking off, the full-sized tube comes with a bonus Lights, Camera, Lashes 4-in-1 Mascara to test together, too.