NBTY Inc., a manufacturer, distributor and retailer of vitamins and supplements, is selling its Vitamin World retail business, including its e-commerce site and retail stores, to a private investment firm.

NBTY, ranked No. 175 in the Internet Retailer 2015 Top 500 Guide for the sales generated across its four direct-to-consumer e-commerce sites, including VitaminWorld.com, says it expects to close the deal with Centre Lane Partners by mid-February. The companies did not release the deal terms. NBTY is owned by investment firm The Carlyle Group, which bought NBTY in 2010 in a deal worth $3.8 billion.

NBTY is primarily a manufacturing business; its brands include Nature’s Bounty, Sundown Naturals, Osteo Bi-Flex and Pure Protein. The company says its investment focus is on building its core brands. “For some time, it has been clear that [Vitamin World] should be a stand-alone business with the right investment and resources tailored to a retail operation,” says Steve Cahillane, NBTY president and CEO.

There are 380 Vitamin World stores in the United States and U.S. territories, down from 414 at the end of 2014.