The Neutrogena Healthy Lashes Lash Enhancer Serum is a top-rated lash enhancer that is highly recommended by Amazon users. This serum is formulated with a blend of peptides, biotin, and antioxidants that help to nourish and strengthen the lashes. It is designed to be applied daily to clean lashes, and many users have reported seeing visible improvement in the length and fullness of their lashes within a few weeks of use. The serum is also ophthalmologist-tested and safe for contact lens wearers. If you're looking for a lash enhancer that is backed by positive reviews and delivers noticeable results, the Neutrogena Healthy Lashes Lash Enhancer Serum is a great option.