OLAPLEX Lashbond Building Serum unlocks the potential of natural lashes. This clear, lightweight serum uses a proprietary peptide complex to support the natural lash growth cycle. It cultivates healthier-looking lashes in as little as two weeks. In approximately four weeks, experience longer and fuller-looking lashes. The serum’s formula is ophthalmologist-tested and prostaglandin-free, which allows for contact lens use.