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When Mary May started buying from third-party sellers on Walmart's online marketplace , she said she assumed the products she was purchasing were the same as the ones she'd long bought in stores.

So in late March when she said she saw a "ridiculous sale" on her favorite Neuriva brain supplements on Walmart 's marketplace, she bought eight bottles for her and her sister.

But when some of the once-daily oral supplements arrived from a seller calling itself Lifeworks-ACS, the 59-year-old mother of three noticed there were misspellings on the bottle and the packaging looked different than it usually did. Weeks later, CNBC confirmed the supplements were counterfeit – and the seller had taken the identity of

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