The One Lash Serum That Really, Truly Gave Me Fuller Eyelashes

The only eyelash serum that “works” for growth is Latisse, which is the one FDA-approved eyelash serum that has been scientifically proven to encourage eyelash growth. It works by enhancing the growth phase of your lashes (FYI: hair has a growth phase, a resting phase, and a shedding phase), says dermatologist Mona Gohara, MD. What Latisse does—or, specifically, what its active ingredient called bimatoprost does—is help stretch the timeline of the growth phase, so your lashes can grow longer before they naturally fall out (the shedding phase).

But whether or not over-the-counter eyelash serums “work” for hair growth, the answer would be no—or at best, maybe. According to Dr. Gohara, most eyelash serums will condition and support the keratin in your lashes, kind of like a conditioner. “Lash conditioners may help strengthen lashes, prevent them from breaking, or lightly swell them so they look a little thicker,” says ophthalmologist Ilyse Haberman, MD.

Just note that if you’re experiencing major lash loss, you should first see your doctor to figure out what’s causing the hair loss before stocking up on a lash serum, says Dr. Gohara. Eyelash loss can be caused by a host of factors, including alopecia, medication side effects, age, and certain disorders. When in doubt (or anxiety), head to your dermatologist.