Herbalife Shares Rise as Carl Icahn Ups His Stake, but Jim Cramer Is Cautious

Shares of Herbalife rose Monday on news Carl Icahn increased his stake. But Jim Cramer is more cautious.
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Jim Cramer says shares of Herbalife  (HLF) - Get Report  are hard to value because he's not sure how much the company can earn. Investor Carl Icahn recently increased his stake in the company, which has been targeted by activist investor Bill Ackman.