Herbalife has reached a deal with the Federal Trade Commission (FTC) to avoid being labeled a pyramid scheme.

The dietary supplement company agreed to pay $200 million to settle the accusations.

The FTC had been investigating whether Herbalife misled customers about the potential value of reselling its products.

The deal was a blow to activist investor Bill Ackman who was betting against the company.

Herbalife shares climbed over 18% at one point.

Bill Ackman made several public allegations that Herbalife was a “bad” company that relied on a hierarchical structure that focused on recruiting new salespeople rather than selling products.

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The FTC investigation also focused on this structure. Herbalife uses a direct sales method where products are bought by distributors to sell to the public and who are also encouraged to bring in new recruits.

The FTC settlement requires Herbalife to reorganize its compensation system to reward retail sales more than recruitment.

The regulator said, only a small proportion of Herbalife distributors earned anything near the amount the company promised.

FTC chairwoman Edith Ramirez said in a statement: “Herbalife is going to have to start operating legitimately, making only truthful claims about how much money its members are likely to make.”

Herbalife marketing material advertised that part-time sellers of its nutritional products would earn between $500 to $1,500 a month. Many distributors, in fact, lost money.

On July 15, Herbalife also announced it was changing its internal governance to allow investor Carl Icahn to own a larger stake in the company.

Carl Icahn will now be able to own 35% of Herbalife shares.

In a statement, Carl Icahan praised Herbalife’s management for the way it handled the investigation. He also said the company should move on and look at possibly acquiring some competitors.

“Now that the company has reached a settlement with the FTC, it is time to consider a range of strategic opportunities, including potential roll-ups involving competitors, as well as other strategic transactions,” he said.

Carl Icahan’s support of Herbalife led to a dispute with Bill Ackman.

Bill Ackman has been “shorting” the company – a strategy where an investor borrows stock and sells it hoping to buy it back at a lower price before the date of return.

The two exchanged insults during an interview calling each other a “liar” and a “cry-baby”.

US Federal Trade Commission has launched an investigation into the operations of nutrition and weight-loss firm Herbalife.

The FTC move follows allegations that the company operates a “pyramid scheme” – making money from recruiting new distributors, rather than sales.

Herbalife has denied these allegations and said it would “cooperate fully” with the FTC inquiry.

Its shares fell by as much as 16%.

But they recovered slightly and ended the day down by 7%.

“Herbalife welcomes the inquiry given the tremendous amount of misinformation in the marketplace,” the company said in a statement.

“We are confident that Herbalife is in compliance with all applicable laws and regulations.”

Herbalife sells a range of nutritional products across the globe through a network of independent distributors

The investigation comes just a day after prominent hedge fund manager, William Ackman, renewed his attack on the firm.

William Ackman has been one of Herbalife’s biggest critics and has a $1 billion short sale position on the firm’s stock – betting that the share price will drop.

He first publically accused Herbalife of running a pyramid scheme in 2012.

On Tuesday, William Ackman accused the company’s China business of violating direct-selling laws in the country, something Herbalife denies.

China is one of the fastest growing markets for the firm and its sales there rose 65% in 2013.

Herbalife sells a range of nutritional products across the globe through a network of independent distributors.

It reported revenues of $4.8 billion in 2013, a jump of 18% from the previous year.

The company has got the backing of billionaire investors George Soros and Carl Icahn, who have picked up stakes in the firm.

Herbalife shares have risen by more than 50% over the past 12 months.