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* Stanford says researcher should not be cited in marketing

materials

* Nu Skin target of new allegations from short seller firm

* Shares fall 4 percent

(Adds background on China in paragraphs 8 & 9)

By Anna Yukhananov and Phil Wahba

WASHINGTON/NEW YORK, Aug 16 (Reuters) – Stanford University

has sent a “cease and desist” letter to Nu Skin Enterprises Inc

asking the company to stop using a university

researcher’s name in its advertising, adding new scrutiny to the

skin product maker’s business claims and practices.

According to a copy of the letter emailed to Reuters,

Stanford geneticist Stuart Kim is listed as a “Nu Skin Partner”

in developing its ageLOC anti-aging products, though he has

nothing to do with the company. Nu Skin touts its skin creams

and pills as using innovative technology to “reset” genes that

promote a more youthful look and feel for its clients, according

to its website.

“Neither Dr. Kim nor Stanford is a ‘Nu Skin Partner’ and

neither has anything to do with the company,” states the letter,

signed by Steven Rosen from Stanford’s Office of the General

Counsel.

Stanford asks Nu Skin to remove all references to Kim from

its website by Friday. Kim told Reuters he had previously

collaborated with Nu Skin but stopped the relationship in 2011,

and that he had never received any money from the company.

The news comes hours after short seller Andrew Left’s Citron

Research issued a new report critical of Nu Skin, saying the

firm had misrepresented its relationship with Kim and had never

funded any of his research. Citron also argues the company’s

products could come under greater U.S. regulatory scrutiny.

Citron repeated its allegation that Nu Skin operated an

illegal multi-level marketing scheme in mainland China, the

fastest growing market in direct-selling. It first aired this

accusation last week, hurting Nu Skin shares [ID :nL4E8J7679]

Nu Skin has rejected the accusation. Chief Financial Officer

Ritch Wood said on Wednesday that Nu Skin’s sales model complied

with Chinese regulations.

China’s commerce ministry did not respond immediately on

Friday to requests for comment on Nu Skin’s sales model.

Direct selling has a turbulent history in China. Beijing

cracked down on illegal pyramid-type marketing schemes in the

late 1990s, after so me of them c ollapsed and led to riots by

angry consumers who had not received their purchased goods.

China banned d ir ect-selling firms in 1 998, in cluding U.S.-based

group Amway, though it lifte d the restr iction seve n years later.

Shares of Nu Skin closed down 4 percent on Thursday at

$40.82 on the New York Stock Exchange, as investors questioned

whether it had been misrepresenting the science behind its

anti-aging skin products that make up 40 percent of sales.

A Stanford spokesman said the university’s dermatology

department has a separate, long-standing relationship with Nu

Skin, including a clinical trial in progress.

Nu Skin said its relationship with Stanford began in 1999.

In 2009, it gave $1.5 million to a study on human skin aging

with Kim and other scientists. Kim later left the study, but two

dermatologists, Dr. Anne Chang and Dr. Alfred Lane, continue to

work on the study, Nu Skin said.

“During the past 13 years, Nu Skin has funded multiple

research studies at Stanford, which have resulted in papers

published around the world,” a company spokesperson said.

SCIENCE BEHIND THE CLAIMS

On Thursday, Citron also accused Nu Skin of exaggerating the

scientific claims of its anti-aging products and said that would

make them vulnerable to scrutiny by the U.S. Food and Drug

Administration.

In a regulatory filing last week, Nu Skin said the FDA had

recently stopped shipments of the company’s Galvanic Spa facial

treatments, which use an electric device to deliver a purifying

skin gel. The agency now believes the product could require

clearance as a medical device. These facial treatments made up

less than 1 percent of revenue in 2011, Nu Skin said.

In a further update on Thursday, the company said it has

stopped all imports of the Galvanic treatments and was prepared

to register the product as a medical device. The FDA clearance

could take 6 to 9 months, the company said.

But Citron Research said FDA clearance may be required for

other Nu Skin ageLOC products, and could potentially lead to

their recall in the United States if the FDA decides they could

be considered drugs.

The FDA treats all products that make medical claims as

drugs, and a company would have to conduct trials to prove the

claims before they could sell their products. Cosmetic products

do not require clinical trials or FDA approval before they are

sold.

Nu Skin CFO Wood on Thursday told analysts at a conference

in Boston that the company expects sales of the ageLOC family of

products to reach $800 million, or roughly 40 percent of what

Wall Street analysts think the company will take in this year,

according to a webcast of the meeting.

(Additional reporting by Daniel Bases in New York, Yan Huang in

Beijing and Donny Kwok in Hong Kong; Editing by Michele

Gershberg, Steve Orlofsky, Richard Chang and Mark Bendeich)