The Covergirl Lash Blast Lash & Brow Serum is a versatile lash enhancer that can be used on both lashes and brows. This serum is enriched with biotin and peptides, which help to nourish and strengthen the lashes and brows. With regular use, you can expect to see visibly longer and fuller lashes and brows in just 4 weeks. The serum has a lightweight formula that is easy to apply and is suitable for all skin types. Whether you want to enhance the appearance of your lashes or brows, the Covergirl Lash Blast Lash & Brow Serum is a great option on Amazon Prime Day.