Did you know that there are certain types of eyelash serums specifically for lash extensions? Here at Nichole Lash Studio only purchasing the recommended products from our salon. Revitaltalash ,Viviscal Vitamins , Proper lash shamppo these products have been around for years and have proven to be safe for lash extensions and the lash extension retention.  Be sure that your make-ups and or serums are approved through your lash technician.