In one of the latest beauty trends circulating on TikTok, influencers, bloggers, and other beauty-obsessed users claim that over-the-counter eyelash serums are miraculously transforming their lashes. Sharing before-and-after imagery, they claim these products helped lengthen and thicken their lashes in weeks. People are taking notice: Searches for “lash growth serum” have racked up more than 2.4 billion views, and the hashtag #lashgrowthserum tops 2.4 million on the social media platform.

But are these eyelash growth serums legit and worth your money — or could they be causing undue harm?

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