LashMD

Why you’ll love it: This lash serum, which contains vitamins, peptides, and amino acids, is easy to paint along your lash line. The brand claims its serum can help lashes look longer and thicker in one to three months.

How you’ll use it: We like to do an overnight patch test on our inner arm first—a good idea when using a serum close to the eyes. Paint the serum along your lash line as you would a liquid liner, using one dip for both eyes.