Extension-building microfibers and a creamy, ultra-conditioning formula is what makes this eyelash primer from Lancome a stand-out in the beauty world. Consistently at the top of the pack when it comes to rave reviews and rankings, this two-in-one primer pampers lashes while you sleep and streamlines your morning mascara application with vitamin-charged conditioners that create a smooth and lengthy canvas.

Known for their skin-loving and cruelty-free formulations, it comes as no surprise that Tarte's Opening Act Lash Primer provides extension-like results in addition to an impressive (not to mention pronounceable) ingredient list. Olive esters, beeswax and cellulose work to naturally soften, smooth and thicken lashes for sultry, super-sized results. Our suggestion? Apply this eyelash primer prior to one (or three) coats of one of the brand's award-winning mascaras. The Lights, Camera, Lashes 4-in-1 Mascara, $21, is a beauty editor favorite.

If your lash line has been feeling comparatively sparse or fragile as of late, this ophthalmologist-tested formula from Clinique might be the key to a fuller, flirtier flutter. Just a few swipes of this polymer-packed potion expertly extends the luscious look of your day-to-day mascara application, while simultaneously moisturizing brittle and tired lashes. A simple upward swipe through your fringe powers your mascara through high-stress meetings and your favorite E.O.D. spin class — no flakes or streaks in sight.

Consider this do-it-all eyelash primer the Thelma to your curler's Louise. The ultimate power couple, this hydrating mascara base from Shiseido preps and maintains lashes for a sumptuously dramatic look that stays put all day. First use your curler (this one by Shiseido is a celebrity and makeup artist favorite) and then work the primer's thirst-quenching formula from roots to tips. The oil-infused product sets the curl of your lashes while intensifying length and volume.

There are two types of people in this world: those who like their mascara clumpy and those who, well, don't. If you identify as the latter, say hello to LashFood's Conditioning Collagen Lash Primer — aka your new partner in crime for perfectly separated fringe. With protein-rich peptides, thickening microfibers and lash-plumping collagen, there really isn't much this eyelash primer doesn't do for your lashes. As microfibers shape and lengthen, nourishing peptides and collagen fortify lashes from the inside out, stimulating long-term strength and body.