.. 5 . The serum lengthens, thickens and strengthens the eyelashes, and improves their condition. The serum is also rich in peptides that moisturize, soften and strengthen the surface of the eyelashes. In addition, the serum contains vitamin B5, which penetrates the hair fibers, improves their structure, and makes them stronger, shinier and more flexible. It also contains substances that prevent irritation and redness.