Multiple shoppers took to social media to complain about the fashion retailer after receiving diet bars they didn't order.
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The company said the free samples were sent out as part of a marketing campaign and were included with online orders in all sizes and categories.
Forever 21 apologized for the incident and called the move an "oversight."
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The company said all free samples have been removed from future orders.
Atkins released the following statement:
"Today's Atkins is focused on a lifestyle nutritional approach where everyone can benefit from overall health and wellbeing. Our brand evolution is reflected in the current marketing efforts to highlight the health benefits of eating a low carb/low sugar Atkins lifestyle, with a portfolio of nutritious and delicious snacks for everyone. The intention of sampling Atkins products is to share snacks that taste great with optimal nutritional benefit."