It is difficult to determine the benefits of apple cider vinegar for eyelash growth, but some people swear by its claims. According to the Natural Solutions for Healthy eyes website, apple cider vinegar is a "natural preservative and astringent" that can help clear skin and acne, increase circulation, and improve skin tone. It can also help stimulate the growth of new eyelashes from the existing hair follicles. According to some sources, regular use of apple cider vinegar can result in thicker, longer eyelashes.