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Makeup Artist Program Active ingredients:Peptides, botanicals Best for:Conditioning lashes Application method:Brush Cruelty-free:Yes Earn Up To 5 Free Gifts $130 VALUE TC Apply Get 15% off your first order According to Garshick, lash serums are powered by a combination of ingredients formulated to strengthen and support lash health. For example, peptides or biotin can help strengthen and thicken hairs, while antioxidants or hydrating ingredients like panthenol help nourish and condition each hair. Something like Latisse, on the other hand, works via a prostaglandin analog which “may help to increase the percentage of follicles and prolong the duration of anagen, which is the hair growth phase”—basically, stimulating the hair follicle to promote growth—Garshick explains.