Best Overall: Dr. Lara Devgan Scientific Beauty Platinum Long Lash Serum

Why We Love It: Award-winning plastic surgeon Dr. Lara Devgan’s line of science-backed products comes with some serious clout. The Platinum Long Lash Serum is stamped with Sephora’s clean seal of approval and backed by clinical results. After two weeks of use, patients in a clinical study saw a 25% increase in lash length. After a month? More than 70% lash density. After two months, there was an average 45% increase in new eyelash growth without the telltale darkening of skin and eye color that often comes with PGA formulas.

Who It's For: Anyone who wants longer and healthier lashes and eyebrows.

Do eyelash serums really work?

With consistent use (i.e. weeks, and sometimes months)—and the right formula for your needs—you should be able to see positive results. “Lash growth serums work to strengthen, nourish and condition the eyebrow hairs which may give the hairs a thicker and healthier appearance,” Garshick explains. “By improving the health of the lash hair, it may also help make it less susceptible to breakage.”

How do lash serums work?

According to Garshick, lash serums are powered by a combination of ingredients formulated to strengthen and support lash health. For example, peptides or biotin can help strengthen and thicken hairs, while antioxidants or hydrating ingredients like panthenol help nourish and condition each hair.

Do lashes grow back?

Eyelashes can grow back, though growth serums are mainly formulated to improve existing “lash thickness, volume and length,” Garshick says.

How long does it take for lashes to grow?

If only it were as simple as applying your eyelash growth serum at night and seeing visibly longer lashes come morning. In reality, Garshick explains that sometimes results can be seen as early as 2-4 weeks, though it will generally take several months for the full effect. She continues that “the results are maintained with continued use of the serum or product, though in many cases, once desired results are achieved, the number of applications per week may be reduced.”

Is eyelash growth serum safe for your eyes?

According to Tsai, most eyelash growth serums are safe to use; however, it depends on the ingredients. “If the serum contains prostaglandin analogs, which stimulate lash growth, it may also have side effects such as eye irritation, skin darkening, iris color change, and possible orbital fat loss.”