This Eyelash Tonic from Yegi Beauty is the perfect way to nourish your lashes with a keratin boost that improves their look and feel. You can use this serum right after perming and even for everyday use. It also works on lash extensions! We love this tonic for our clients because you can help their lashes grow longer and shine brighter. Our Yegi Beauty experts recommend using the serum on everyone who wants to grow healthy strong lashes — even if they’re using lash extensions.