Beauty You Have One Day to Get the Eyelash Serum Shoppers Call a "Miracle Worker in a Tube" for 30% Off Brooke Shields swears by the product. By Eden Lichterman Eden Lichterman Instagram Twitter Eden Lichterman is an Amazon Ecommerce Writer for Meredith brands including InStyle and People. InStyle's editorial guidelines Published on February 19, 2022 @ 09:00AM Pin Share Tweet Email We independently research, test, review, and recommend the best products—learn more about our process. If you buy something through our links, we may earn a commission. Photo: Amazon/InStyle If you didn't already know, today is National Lash Day. While made-up holidays like this are usually just an opportunity to post silly social media content, we can actually benefit from today's event. In honor of this eyelash celebration, Amazon put both the three- and six-month supplies of the popular GrandeLash-MD Lash-Enhancing Serum on sale for 30 percent off. The lash-growth serum has more than 18,000 five-star ratings on Amazon and a stamp of approval from the lash-and-brow-queen herself, Brooke Shields. Surprisingly, the supermodel uses the product to thicken her enviable eyebrows, showing just how versatile it truly is. Courtesy Shop now: $46 (Originally $65); amazon.com A few of the key ingredients that make this serum work are amino acids to repair and strengthen damaged lashes, hyaluronic acid to condition and hydrate, and vitamin E to moisturize, so your lashes can grow longer and thicker. According to the brand, you'll start to see results around the three-week mark, and your lashes will reach their full potential after nine weeks. To use the serum, apply it once a day across your lash line on your eyelid, like you would to put on eyeliner. It can take one to two minutes for the product to fully dry and penetrate your lashes. This Growth-Encouraging Mascara Is "Life-Changing," According to Both Shoppers and Editors In the reviews section, the overall consensus is that the GrandeLash-MD serum can transform even the shortest and straightest eyelashes into long, effortlessly curled ones. One shopper, who was "skeptical that any product like this would work," confirmed that they "saw results within the first month of using this product" and even called it "a little miracle worker in tube." A second reviewer said their lashes felt "healthier, longer, and thicker" after using the product for two weeks, while a third wrote that "applying mascara is so much easier and less time-consuming than it used to be." Today is your only chance to get the GrandeLash-MD Lash-Enhancing Serum shoppers are raving about for 30 percent off, so be sure to grab it before time runs out. Courtesy Shop now: $84 (Originally $120); amazon.com