Our Lash Serum is peptide-based and does not contain prostaglandin or its derivates. So it does not irritate and is suitable for sensitive eyes. Daily use of Lash Serum ensures up to 72% increase in eyelash length and density after 42 days of consecutive use. - Our lash serum stimulates eyelash growth up to 72% in eyelash length and density. - You can see noticeable results in just 42 days of consecutive use. - You can use Ruthie’s lash serum with eyelash extensions. - The product is peptide-based and contains natural herbal extracts.