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Luigi Gratton

Our experts

Our doctors, trainers, dietitians and advisory board members include more than 300 internationally recognized experts and key opinion leaders. With specializations in nutrition, fitness and public health, they guide research that drives product innovation. They educate and train our Herbalife Independent Distributors who then guide and support their customers to achieve their goals and live their best lives.

Global experts

Susan Bowerman-image
Susan Bowerman

M.S., R.D., CSSD, CSOWM, FAND – Senior Director, Worldwide Nutrition Education and Training
Chair, Herbalife Dietetic Advisory Board and Outer Nutrition Advisory Board

Luigi Gratton-image
Luigi Gratton

M.D., MPH – Vice President, Office of Health and Wellness
Chair, Herbalife Nutrition Advisory Board

David Heber-image
David Heber

​​M.D., Ph.D., FACP, FASN – Chairman, Herbalife Nutrition Institute​

John Heiss-image
John Heiss

Ph.D. – Vice President, Global Product Innovation
Member, Herbalife Nutrition Advisory Board


Rocio Medina Badiano-image
Rocio Medina Badiano

M.D. – Cochairperson and Member, Nutrition Advisory Board

Dana Ryan-image
Dana Ryan

Ph.D., MA, MBA – Director, Sports Performance, Nutrition and Education

Chair, Herbalife Fitness Advisory Board

Gary Small-image
Gary Small

M.D. – Member, Herbalife Nutrition Advisory Board

Zhen-Yu Chen-image
Zhen-Yu Chen

Ph.D. – Member, Nutrition Advisory Board

Masashi Miyashita-image
Masashi Miyashita

Ph.D. – Member, Nutrition Advisory Board


Ph.D. – Member, Nutrition Advisory Board

Chin-Kun Wang-image
Chin-Kun Wang

Ph.D. – Member, Nutrition Advisory Board