Nutrition and weight-loss company Herbalife Ltd said it had agreed to give three more seats on its board to billionaire investor Carl Icahn, who has supported the company as short-sellers attacked its business practices. Herbalife shares, which were up 6.8 percent in early afternoon trading, also got a boost from news that rival direct-seller NU Skin Enterprises Inc had been fined just $540,000 by Chinese regulators for illegal sales practices. NU Skin’s shares were up 18.6 percent. Herbalife shares had lost more than a third of their value since NU Skin said in January that Chinese authorities had launched probes into its business.