About the Authors

Remo Campiche

Roles Conceptualization, Project administration, Resources, Writing – original draft, Writing – review & editing

remo.campiche@dsm.com

Affiliation DSM Nutritional Products, Personal Care & Aroma, Kaiseraugst, Switzerland

Maria Daniltchenko

Roles Data curation, Formal analysis, Investigation, Methodology

Affiliation Department of Psychosomatic Medicine, Charité Center (CC12) for Internal Medicine and Dermatology, Universitätsmedizin-Charité, Berlin, Germany

Dominik Imfeld

Roles Data curation, Resources, Supervision, Writing – review & editing

Affiliation DSM Nutritional Products, Personal Care & Aroma, Kaiseraugst, Switzerland

Eva M. J. Peters

Roles Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Visualization, Writing – review & editing

Affiliations Department of Psychosomatic Medicine, Charité Center (CC12) for Internal Medicine and Dermatology, Universitätsmedizin-Charité, Berlin, Germany, Psychoneuroimmunology Laboratory, Department of Psychosomatic Medicine and Psychotherapy, University Hospital Giessen and Marburg, Giessen, Germany

Competing Interests

RC and DI are employees of DSM Nutritional Products and received regular salaries from the company. EMJP is the inventor and DSM Nutritional Products the owner of patent WO2011128339 entitled, Hair treatment composition containing gambogic acid, ester, or amide. There are no other patents, products in development, or marketed products to declare. This does not alter our adherence to all PLOS ONE policies on sharing data and materials.