“The best of your kohl is antimony, for it improves the eyesight and makes the hair (eyelashes) grow.” (Using translation from Ibn Mājah 3497)   

أَنَّ رَسُولَ اللهِ ﷺ قَالَ «إِنَّ مِنْ خَيْرِ أَكْحَالِكُمُ الْإِثْمِدُ إِنَّهُ يَجْلُو الْبَصَرَ وَيُنْبِتُ الشَّعْرَ»