Want lusher lashes? Skip the prescription products that may come along with lots of unpleasant side effects (think itchy, red eyes) and reach for a nontoxic option. There are plenty of natural ingredients that encourage lash growth and thickness, says David Colbert, M.D., a dermatologist in New York City. Look for Swiss apple stem cells and polypeptide 7 to lengthen the growth cycle of lashes, as well as aloe leaf extract and panthenol to condition hairs so they won’t break or fall out as easily, resulting in a thicker appearance. Our picks: B Kamins Chemist Bio-Maple Eyelash Fortifier ($90; beauty.com) and Talika Eyelash Lipocils ($29-$58; talika.com).