NEW YORK and RONKONKOMA, N.Y. — Asset management firm The Carlyle Group has completed its $4 billion acquisition of nutritional supplements maker and marketer NBTY Inc.

Under the merger agreement, NBTY stockholders receive $55 in cash for each share of NBTY common stock owned by them. And with the merger, NBTY’s common stock will no longer be listed for trading on the New York Stock Exchange.

Carlyle Group and NBTY unveiled the deal, originally valued at $3.8 billion, in July. At the time, the transaction was of the biggest private equity deals in 2010.

NBTY’s roster of dietary supplement brands includes Nature’s Bounty, Osteo Bi-Flex, Sundown, MET-Rx, Ester-C and Pure Protein.