About the Authors

Maja D. K. Fedder

Affiliation Laboratory of Reproductive Biology, Scientific Unit, Regional Hospital of Horsens, Horsens, Denmark

Henrik B. Jakobsen

Affiliation Nerthus ApS, Lejre, Denmark

Ina Giversen

Affiliation Nerthus ApS, Lejre, Denmark

Lars P. Christensen

Affiliation Department of Chemical Engineering, Biotechnology and Environmental Technology, Faculty of Engineering, University of Southern Denmark, Odense, Denmark

Erik T. Parner

Affiliation Department of Public Health, Section for Biostatistics, University of Aarhus, Aarhus, Denmark

Jens Fedder

fedder@dadlnet.dk

Affiliations Laboratory of Reproductive Biology, Scientific Unit, Regional Hospital of Horsens, Horsens, Denmark, Centre of Andrology, Fertility Clinic, Department D, Odense University Hospital, Odense, Denmark

Competing Interests

Two of the authors (IG and HBJ) are commercializing the product; however, their company, Nerthus APS, has not contributed financially to the study. The full names of the two filed patent applications are: Dry preparation of Alpinia galanga or Alpinia conchigera with high content of 1′S-1′-acetoxychavicol acetate:(Application no. PCT/EP2014/061880); and Composition for enhancing semen quality in a male subject: (Application no. PCT/EP2014/061851). The product name of the food supplement: Punalpin®. There are no further patents, products in development, or marketed products to declare. This does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials, as detailed online in the guide for authors.

Author Contributions

Conceived and designed the experiments: IG HBJ JF. Performed the experiments: JF MDKF LPC. Analyzed the data: ETP IG HBJ LPC JF MDKF. Contributed reagents/materials/analysis tools: IG HBJ. Wrote the paper: JF MDKF IG HBJ LPC ETP.