Here at Allure, National Vitamin C Day is right up there with Halloween and New Year’s Eve among our favorite beauty holidays. It’s hard to get more festive than serious antioxidant protection. So, on April 4 (this year’s NVCD), we’re going to celebrate by sharing one of our most loved vitamin C serums with you! The first 500 people to complete the form in our link-in bio will receive a fun mailer—just like the ones our editors get every day—with products to test. UPDATE: We’ve reached our first 500 sign ups. Thank you all for your participation. Though we’ve reached our goal, we’d still love to stay in touch. Submit your email to be the first to hear about future opportunities to participate and test products!