As a short explanation, careprost eyelash serum help the hairs grow longer and thicker while they are still in the growth phase. Peptides are short bands of amino acids, which are the building blocks of protein. They are what most serums are made of today. Since about 80% of your eyelashes are made up of keratin protein, it's easy to see how a top-up can help them grow longer and thicker.
A lot of the best lash serums also have vitamins and nutrients in them to help keep the lashes healthy. Biotin, which helps the body break down protein, and panthenol, which keeps the skin wet, are often added.
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