Investment giant KKR, which owns stakes in everything from GoDaddy to Hicksville’s Broadway Mall, is buying a majority share of Nature’s Bounty, the Ronkonkoma-based vitamin and food supplement maker.

Financial details were not released, but insiders peg the purchase price at $3 billion. The current owner, the international investment group Carlyle, is keeping a “significant” percentage of NBTY. It paid $3.8 billion for the full company in 2010.

NBTY brands include Nature’s Bounty, Pure Protein, Body Fortress, Sundown Naturals, Puritan’s Pride and Osteo Bi-Flex, among others.

In an unrelated deal, KKR’s Internet Brands portfolio company announced Monday that it has agreed to buy health news site WebMD for $2.8 billion.

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